40989931 has 2 divisors, whose sum is σ = 40989932. Its totient is φ = 40989930.

The previous prime is 40989917. The next prime is 40989943. The reversal of 40989931 is 13998904.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40989931 - 2⁵ = 40989899 is a prime.

It is a super-2 number, since 2×40989931² = 3360348886769522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40989131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20494965 + 20494966.

It is an arithmetic number, because the mean of its divisors is an integer number (20494966).

Almost surely, 2^40989931 is an apocalyptic number.

40989931 is a deficient number, since it is larger than the sum of its proper divisors (1).

40989931 is an equidigital number, since it uses as much as digits as its factorization.

40989931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 40989931 is about 6402.3379323494. The cubic root of 40989931 is about 344.7934940041.

The spelling of 40989931 in words is "forty million, nine hundred eighty-nine thousand, nine hundred thirty-one".