39408699639 has 4 divisors (see below), whose sum is σ = 52544932856. Its totient is φ = 26272466424.

The previous prime is 39408699623. The next prime is 39408699643. The reversal of 39408699639 is 93699680493.

39408699639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93699680493 = 3 ⋅31233226831.

It is not a de Polignac number, because 39408699639 - 2⁴ = 39408699623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39408699639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39408699689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6568116604 + ... + 6568116609.

It is an arithmetic number, because the mean of its divisors is an integer number (13136233214).

Almost surely, 2^39408699639 is an apocalyptic number.

39408699639 is a deficient number, since it is larger than the sum of its proper divisors (13136233217).

39408699639 is a wasteful number, since it uses less digits than its factorization.

39408699639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13136233216.

The product of its (nonzero) digits is 68024448, while the sum is 66.

The spelling of 39408699639 in words is "thirty-nine billion, four hundred eight million, six hundred ninety-nine thousand, six hundred thirty-nine".