40175921 has 2 divisors, whose sum is σ = 40175922. Its totient is φ = 40175920.

The previous prime is 40175909. The next prime is 40175951. The reversal of 40175921 is 12957104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38887696 + 1288225 = 6236^2 + 1135^2 .

It is a cyclic number.

It is not a de Polignac number, because 40175921 - 2¹⁸ = 39913777 is a prime.

It is a super-2 number, since 2×40175921² = 3228209256396482, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40175951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20087960 + 20087961.

It is an arithmetic number, because the mean of its divisors is an integer number (20087961).

Almost surely, 2^40175921 is an apocalyptic number.

It is an amenable number.

40175921 is a deficient number, since it is larger than the sum of its proper divisors (1).

40175921 is an equidigital number, since it uses as much as digits as its factorization.

40175921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 40175921 is about 6338.4478383907. The cubic root of 40175921 is about 342.4958239141.

The spelling of 40175921 in words is "forty million, one hundred seventy-five thousand, nine hundred twenty-one".