40172816 has 10 divisors (see below), whose sum is σ = 77834862. Its totient is φ = 20086400.

The previous prime is 40172813. The next prime is 40172833. The reversal of 40172816 is 61827104.

It can be written as a sum of positive squares in only one way, i.e., 32444416 + 7728400 = 5696^2 + 2780^2 .

It is a super-2 number, since 2×40172816² = 3227710290739712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40172813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1255385 + ... + 1255416.

Almost surely, 2^40172816 is an apocalyptic number.

It is an amenable number.

40172816 is a deficient number, since it is larger than the sum of its proper divisors (37662046).

40172816 is a wasteful number, since it uses less digits than its factorization.

40172816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2510809 (or 2510803 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 40172816 is about 6338.2028998763. The cubic root of 40172816 is about 342.4870004124.

The spelling of 40172816 in words is "forty million, one hundred seventy-two thousand, eight hundred sixteen".