185138564 has 24 divisors (see below), whose sum is σ = 357033600. Its totient is φ = 83460384.

The previous prime is 185138563. The next prime is 185138573. The reversal of 185138564 is 465831581.

It is not an unprimeable number, because it can be changed into a prime (185138563) 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 7 ways as a sum of consecutive naturals, for example, 39164 + ... + 43635.

It is an arithmetic number, because the mean of its divisors is an integer number (14876400).

Almost surely, 2^185138564 is an apocalyptic number.

It is an amenable number.

185138564 is a deficient number, since it is larger than the sum of its proper divisors (171895036).

185138564 is a wasteful number, since it uses less digits than its factorization.

185138564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82859 (or 82857 counting only the distinct ones).

The product of its digits is 115200, while the sum is 41.

The square root of 185138564 is about 13606.5632692462. The cubic root of 185138564 is about 569.9441455478.

The spelling of 185138564 in words is "one hundred eighty-five million, one hundred thirty-eight thousand, five hundred sixty-four".