39988903891 has 2 divisors, whose sum is σ = 39988903892. Its totient is φ = 39988903890.

The previous prime is 39988903883. The next prime is 39988903943. The reversal of 39988903891 is 19830988993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39988903891 - 2³ = 39988903883 is a prime.

It is a super-2 number, since 2×39988903891² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39988901891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19994451945 + 19994451946.

It is an arithmetic number, because the mean of its divisors is an integer number (19994451946).

Almost surely, 2^39988903891 is an apocalyptic number.

39988903891 is a deficient number, since it is larger than the sum of its proper divisors (1).

39988903891 is an equidigital number, since it uses as much as digits as its factorization.

39988903891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30233088, while the sum is 67.

The spelling of 39988903891 in words is "thirty-nine billion, nine hundred eighty-eight million, nine hundred three thousand, eight hundred ninety-one".