40646987 has 2 divisors, whose sum is σ = 40646988. Its totient is φ = 40646986.

The previous prime is 40646981. The next prime is 40647059. The reversal of 40646987 is 78964604.

40646987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40646987 - 2⁴ = 40646971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40646981) 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, 20323493 + 20323494.

It is an arithmetic number, because the mean of its divisors is an integer number (20323494).

Almost surely, 2^40646987 is an apocalyptic number.

40646987 is a deficient number, since it is larger than the sum of its proper divisors (1).

40646987 is an equidigital number, since it uses as much as digits as its factorization.

40646987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 40646987 is about 6375.4989608657. The cubic root of 40646987 is about 343.8292233049.

The spelling of 40646987 in words is "forty million, six hundred forty-six thousand, nine hundred eighty-seven".