40897931 has 2 divisors, whose sum is σ = 40897932. Its totient is φ = 40897930.

The previous prime is 40897921. The next prime is 40897957. The reversal of 40897931 is 13979804.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40897931 - 2⁶ = 40897867 is a prime.

It is a super-2 number, since 2×40897931² = 3345281520161522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40897921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20448965 + 20448966.

It is an arithmetic number, because the mean of its divisors is an integer number (20448966).

Almost surely, 2^40897931 is an apocalyptic number.

40897931 is a deficient number, since it is larger than the sum of its proper divisors (1).

40897931 is an equidigital number, since it uses as much as digits as its factorization.

40897931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 40897931 is about 6395.1490209377. The cubic root of 40897931 is about 344.5353431004.

The spelling of 40897931 in words is "forty million, eight hundred ninety-seven thousand, nine hundred thirty-one".