40890172 has 12 divisors (see below), whose sum is σ = 71880256. Its totient is φ = 20352960.

The previous prime is 40890169. The next prime is 40890173. The reversal of 40890172 is 27109804.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40890173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22029 + ... + 23812.

Almost surely, 2^40890172 is an apocalyptic number.

It is an amenable number.

40890172 is a deficient number, since it is larger than the sum of its proper divisors (30990084).

40890172 is a wasteful number, since it uses less digits than its factorization.

40890172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46068 (or 46066 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 40890172 is about 6394.5423604821. The cubic root of 40890172 is about 344.5135537439.

Adding to 40890172 its reverse (27109804), we get a palindrome (67999976).

The spelling of 40890172 in words is "forty million, eight hundred ninety thousand, one hundred seventy-two".