181974232840 has 32 divisors (see below), whose sum is σ = 409454607960. Its totient is φ = 72787456000.

The previous prime is 181974232799. The next prime is 181974232861. The reversal of 181974232840 is 48232479181.

It can be written as a sum of positive squares in 4 ways, for example, as 77837652036 + 104136580804 = 278994^2 + 322702^2 .

It is a super-2 number, since 2×181974232840² (a number of 23 digits) contains 22 as substring.

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, 2016690 + ... + 2104990.

Almost surely, 2^181974232840 is an apocalyptic number.

181974232840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181974232840 is an abundant number, since it is smaller than the sum of its proper divisors (227480375120).

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

181974232840 is a wasteful number, since it uses less digits than its factorization.

181974232840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139833 (or 139829 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 181974232840 in words is "one hundred eighty-one billion, nine hundred seventy-four million, two hundred thirty-two thousand, eight hundred forty".