39804694987 has 2 divisors, whose sum is σ = 39804694988. Its totient is φ = 39804694986.

The previous prime is 39804694967. The next prime is 39804695011. The reversal of 39804694987 is 78949640893.

It is a weak prime.

It is an emirp because it is prime and its reverse (78949640893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39804694987 - 2³⁵ = 5444956619 is a prime.

It is not a weakly prime, because it can be changed into another prime (39804694967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19902347493 + 19902347494.

It is an arithmetic number, because the mean of its divisors is an integer number (19902347494).

Almost surely, 2^39804694987 is an apocalyptic number.

39804694987 is a deficient number, since it is larger than the sum of its proper divisors (1).

39804694987 is an equidigital number, since it uses as much as digits as its factorization.

39804694987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94058496, while the sum is 67.

The spelling of 39804694987 in words is "thirty-nine billion, eight hundred four million, six hundred ninety-four thousand, nine hundred eighty-seven".