185172945 has 16 divisors (see below), whose sum is σ = 297376512. Its totient is φ = 98392320.

The previous prime is 185172943. The next prime is 185172971. The reversal of 185172945 is 549271581.

It is not a de Polignac number, because 185172945 - 2¹ = 185172943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 185172897 and 185172906.

It is not an unprimeable number, because it can be changed into a prime (185172943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18712 + ... + 26841.

It is an arithmetic number, because the mean of its divisors is an integer number (18586032).

Almost surely, 2^185172945 is an apocalyptic number.

185172945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

185172945 is a deficient number, since it is larger than the sum of its proper divisors (112203567).

185172945 is a wasteful number, since it uses less digits than its factorization.

185172945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45832.

The product of its digits is 100800, while the sum is 42.

The square root of 185172945 is about 13607.8266082428. The cubic root of 185172945 is about 569.9794236955.

The spelling of 185172945 in words is "one hundred eighty-five million, one hundred seventy-two thousand, nine hundred forty-five".