181118940 has 24 divisors (see below), whose sum is σ = 507133200. Its totient is φ = 48298368.

The previous prime is 181118939. The next prime is 181118981. The reversal of 181118940 is 49811181.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1509265 + ... + 1509384.

It is an arithmetic number, because the mean of its divisors is an integer number (21130550).

Almost surely, 2^181118940 is an apocalyptic number.

181118940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181118940 is an abundant number, since it is smaller than the sum of its proper divisors (326014260).

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

181118940 is a wasteful number, since it uses less digits than its factorization.

181118940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3018661 (or 3018659 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 33.

The square root of 181118940 is about 13458.0436914137. The cubic root of 181118940 is about 565.7891601088.

The spelling of 181118940 in words is "one hundred eighty-one million, one hundred eighteen thousand, nine hundred forty".