39799987 has 2 divisors, whose sum is σ = 39799988. Its totient is φ = 39799986.

The previous prime is 39799967. The next prime is 39800011. The reversal of 39799987 is 78999793.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39799987 - 2¹⁹ = 39275699 is a prime.

It is not a weakly prime, because it can be changed into another prime (39799967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19899993 + 19899994.

It is an arithmetic number, because the mean of its divisors is an integer number (19899994).

Almost surely, 2^39799987 is an apocalyptic number.

39799987 is a deficient number, since it is larger than the sum of its proper divisors (1).

39799987 is an equidigital number, since it uses as much as digits as its factorization.

39799987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7715736, while the sum is 61.

The square root of 39799987 is about 6308.7230879157. The cubic root of 39799987 is about 341.4242075453.

The spelling of 39799987 in words is "thirty-nine million, seven hundred ninety-nine thousand, nine hundred eighty-seven".