1855110972 has 144 divisors (see below), whose sum is σ = 5159089152. Its totient is φ = 514275840.

The previous prime is 1855110937. The next prime is 1855110997. The reversal of 1855110972 is 2790115581.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 1855110972.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3055893 + ... + 3056499.

It is an arithmetic number, because the mean of its divisors is an integer number (35827008).

Almost surely, 2^1855110972 is an apocalyptic number.

1855110972 is a gapful number since it is divisible by the number (12) 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 1855110972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2579544576).

1855110972 is an abundant number, since it is smaller than the sum of its proper divisors (3303978180).

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

1855110972 is a wasteful number, since it uses less digits than its factorization.

1855110972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788 (or 773 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 39.

The square root of 1855110972 is about 43070.9991989970. Note that the first 3 decimals coincide. The cubic root of 1855110972 is about 1228.7304794187.

The spelling of 1855110972 in words is "one billion, eight hundred fifty-five million, one hundred ten thousand, nine hundred seventy-two".