40005172 has 12 divisors (see below), whose sum is σ = 70212100. Its totient is φ = 19944576.

The previous prime is 40005167. The next prime is 40005197. The reversal of 40005172 is 27150004.

It can be written as a sum of positive squares in 2 ways, for example, as 18438436 + 21566736 = 4294^2 + 4644^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12933 + ... + 15724.

Almost surely, 2^40005172 is an apocalyptic number.

It is an amenable number.

40005172 is a deficient number, since it is larger than the sum of its proper divisors (30206928).

40005172 is a wasteful number, since it uses less digits than its factorization.

40005172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29010 (or 29008 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 40005172 is about 6324.9641896219. The cubic root of 40005172 is about 342.0099286928.

Adding to 40005172 its reverse (27150004), we get a palindrome (67155176).

The spelling of 40005172 in words is "forty million, five thousand, one hundred seventy-two".