39894740987 has 2 divisors, whose sum is σ = 39894740988. Its totient is φ = 39894740986.

The previous prime is 39894740981. The next prime is 39894741017. The reversal of 39894740987 is 78904749893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39894740987 - 2⁶ = 39894740923 is a prime.

It is not a weakly prime, because it can be changed into another prime (39894740981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19947370493 + 19947370494.

It is an arithmetic number, because the mean of its divisors is an integer number (19947370494).

Almost surely, 2^39894740987 is an apocalyptic number.

39894740987 is a deficient number, since it is larger than the sum of its proper divisors (1).

39894740987 is an equidigital number, since it uses as much as digits as its factorization.

39894740987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 109734912, while the sum is 68.

It can be divided in two parts, 398947 and 40987, that added together give a palindrome (439934).

The spelling of 39894740987 in words is "thirty-nine billion, eight hundred ninety-four million, seven hundred forty thousand, nine hundred eighty-seven".