40031987 has 2 divisors, whose sum is σ = 40031988. Its totient is φ = 40031986.

The previous prime is 40031969. The next prime is 40032023. The reversal of 40031987 is 78913004.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40031987 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40031287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20015993 + 20015994.

It is an arithmetic number, because the mean of its divisors is an integer number (20015994).

Almost surely, 2^40031987 is an apocalyptic number.

40031987 is a deficient number, since it is larger than the sum of its proper divisors (1).

40031987 is an equidigital number, since it uses as much as digits as its factorization.

40031987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 40031987 is about 6327.0836093733. The cubic root of 40031987 is about 342.0863267139.

The spelling of 40031987 in words is "forty million, thirty-one thousand, nine hundred eighty-seven".