40157972 has 12 divisors (see below), whose sum is σ = 70352436. Its totient is φ = 20057280.

The previous prime is 40157969. The next prime is 40157981. The reversal of 40157972 is 27975104.

It can be written as a sum of positive squares in 2 ways, for example, as 22146436 + 18011536 = 4706^2 + 4244^2 .

It is a super-2 number, since 2×40157972² = 3225325430305568, which contains 22 as substring.

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, 833 + ... + 9000.

It is an arithmetic number, because the mean of its divisors is an integer number (5862703).

Almost surely, 2^40157972 is an apocalyptic number.

It is an amenable number.

40157972 is a deficient number, since it is larger than the sum of its proper divisors (30194464).

40157972 is a wasteful number, since it uses less digits than its factorization.

40157972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10858 (or 10856 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 40157972 is about 6337.0317973007. The cubic root of 40157972 is about 342.4448118228. Note that the first 3 decimals are identical.

The spelling of 40157972 in words is "forty million, one hundred fifty-seven thousand, nine hundred seventy-two".