40175721 has 12 divisors (see below), whose sum is σ = 59904000. Its totient is φ = 25919640.

The previous prime is 40175713. The next prime is 40175731. The reversal of 40175721 is 12757104.

It is not a de Polignac number, because 40175721 - 2³ = 40175713 is a prime.

It is a super-2 number, since 2×40175721² = 3228177115739682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40175711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71721 + ... + 72278.

It is an arithmetic number, because the mean of its divisors is an integer number (4992000).

Almost surely, 2^40175721 is an apocalyptic number.

It is an amenable number.

40175721 is a deficient number, since it is larger than the sum of its proper divisors (19728279).

40175721 is a wasteful number, since it uses less digits than its factorization.

40175721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144036 (or 144033 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

The square root of 40175721 is about 6338.4320616380. The cubic root of 40175721 is about 342.4952555863.

The spelling of 40175721 in words is "forty million, one hundred seventy-five thousand, seven hundred twenty-one".