40405987 has 2 divisors, whose sum is σ = 40405988. Its totient is φ = 40405986.

The previous prime is 40405931. The next prime is 40405993. The reversal of 40405987 is 78950404.

40405987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40405987 is a prime.

It is not a weakly prime, because it can be changed into another prime (40405187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20202993 + 20202994.

It is an arithmetic number, because the mean of its divisors is an integer number (20202994).

Almost surely, 2^40405987 is an apocalyptic number.

40405987 is a deficient number, since it is larger than the sum of its proper divisors (1).

40405987 is an equidigital number, since it uses as much as digits as its factorization.

40405987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 40405987 is about 6356.5703803230. The cubic root of 40405987 is about 343.1483433853.

The spelling of 40405987 in words is "forty million, four hundred five thousand, nine hundred eighty-seven".