1813840158 has 48 divisors (see below), whose sum is σ = 3978097920. Its totient is φ = 551015712.

The previous prime is 1813840157. The next prime is 1813840169. The reversal of 1813840158 is 8510483181.

It is a super-2 number, since 2×1813840158² = 6580032237546929928, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813840157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68785 + ... + 91427.

It is an arithmetic number, because the mean of its divisors is an integer number (82877040).

Almost surely, 2^1813840158 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1813840158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1989048960).

1813840158 is an abundant number, since it is smaller than the sum of its proper divisors (2164257762).

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

1813840158 is a wasteful number, since it uses less digits than its factorization.

1813840158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22753 (or 22740 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 39.

The square root of 1813840158 is about 42589.2023639795. The cubic root of 1813840158 is about 1219.5501696452.

The spelling of 1813840158 in words is "one billion, eight hundred thirteen million, eight hundred forty thousand, one hundred fifty-eight".