40099987 has 2 divisors, whose sum is σ = 40099988. Its totient is φ = 40099986.

The previous prime is 40099981. The next prime is 40100003. The reversal of 40099987 is 78999004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40099987 - 2⁷ = 40099859 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40099981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20049993 + 20049994.

It is an arithmetic number, because the mean of its divisors is an integer number (20049994).

Almost surely, 2^40099987 is an apocalyptic number.

40099987 is a deficient number, since it is larger than the sum of its proper divisors (1).

40099987 is an equidigital number, since it uses as much as digits as its factorization.

40099987 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 46.

The square root of 40099987 is about 6332.4550531370. The cubic root of 40099987 is about 342.2799111712.

The spelling of 40099987 in words is "forty million, ninety-nine thousand, nine hundred eighty-seven".