40172520 has 32 divisors (see below), whose sum is σ = 120517920. Its totient is φ = 10712640.

The previous prime is 40172507. The next prime is 40172521. The reversal of 40172520 is 2527104.

It is a super-2 number, since 2×40172520² = 3227662726300800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40172521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167266 + ... + 167505.

It is an arithmetic number, because the mean of its divisors is an integer number (3766185).

Almost surely, 2^40172520 is an apocalyptic number.

40172520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40172520 is an abundant number, since it is smaller than the sum of its proper divisors (80345400).

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

40172520 is a wasteful number, since it uses less digits than its factorization.

40172520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334785 (or 334781 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 40172520 is about 6338.1795493659. The cubic root of 40172520 is about 342.4861592432.

Adding to 40172520 its reverse (2527104), we get a palindrome (42699624).

The spelling of 40172520 in words is "forty million, one hundred seventy-two thousand, five hundred twenty".