181954903940 has 24 divisors (see below), whose sum is σ = 398718573120. Its totient is φ = 69617528288.

The previous prime is 181954903927. The next prime is 181954903951. The reversal of 181954903940 is 49309459181.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197776610 + ... + 197777529.

It is an arithmetic number, because the mean of its divisors is an integer number (16613273880).

Almost surely, 2^181954903940 is an apocalyptic number.

181954903940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181954903940 is an abundant number, since it is smaller than the sum of its proper divisors (216763669180).

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

181954903940 is a wasteful number, since it uses less digits than its factorization.

181954903940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395554171 (or 395554169 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 53.

The spelling of 181954903940 in words is "one hundred eighty-one billion, nine hundred fifty-four million, nine hundred three thousand, nine hundred forty".