40339987 has 2 divisors, whose sum is σ = 40339988. Its totient is φ = 40339986.

The previous prime is 40339979. The next prime is 40340017. The reversal of 40339987 is 78993304.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40339987 - 2³ = 40339979 is a prime.

It is not a weakly prime, because it can be changed into another prime (40333987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20169993 + 20169994.

It is an arithmetic number, because the mean of its divisors is an integer number (20169994).

Almost surely, 2^40339987 is an apocalyptic number.

40339987 is a deficient number, since it is larger than the sum of its proper divisors (1).

40339987 is an equidigital number, since it uses as much as digits as its factorization.

40339987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 40339987 is about 6351.3767798801. The cubic root of 40339987 is about 342.9614062944.

The spelling of 40339987 in words is "forty million, three hundred thirty-nine thousand, nine hundred eighty-seven".