1855998144 has 896 divisors, whose sum is σ = 7783372800. Its totient is φ = 418037760.

The previous prime is 1855998143. The next prime is 1855998163. The reversal of 1855998144 is 4418995581.

1855998144 is a `hidden beast` number, since 1 + 8 + 5 + 599 + 8 + 1 + 44 = 666.

It is a super-2 number, since 2×1855998144² = 6889458221062889472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1855998143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 50162094 + ... + 50162130.

It is an arithmetic number, because the mean of its divisors is an integer number (8686800).

Almost surely, 2^1855998144 is an apocalyptic number.

1855998144 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1855998144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3891686400).

1855998144 is an abundant number, since it is smaller than the sum of its proper divisors (5927374656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1855998144 is a wasteful number, since it uses less digits than its factorization.

1855998144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118 (or 102 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 54.

The square root of 1855998144 is about 43081.2969164114. The cubic root of 1855998144 is about 1228.9263206320.

It can be divided in two parts, 1855 and 998144, that added together give a palindrome (999999).

The spelling of 1855998144 in words is "one billion, eight hundred fifty-five million, nine hundred ninety-eight thousand, one hundred forty-four".