400185500172 has 24 divisors (see below), whose sum is σ = 933794568000. Its totient is φ = 133391109456.

The previous prime is 400185500147. The next prime is 400185500189. The reversal of 400185500172 is 271005581004.

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, 81922 + ... + 898377.

It is an arithmetic number, because the mean of its divisors is an integer number (38908107000).

Almost surely, 2^400185500172 is an apocalyptic number.

It is an amenable number.

400185500172 is an abundant number, since it is smaller than the sum of its proper divisors (533609067828).

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

400185500172 is a wasteful number, since it uses less digits than its factorization.

400185500172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014325 (or 1014323 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 33.

The spelling of 400185500172 in words is "four hundred billion, one hundred eighty-five million, five hundred thousand, one hundred seventy-two".