39618994279 has 4 divisors (see below), whose sum is σ = 39619394776. Its totient is φ = 39618593784.

The previous prime is 39618994153. The next prime is 39618994307. The reversal of 39618994279 is 97249981693.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 97249981693 = 41 ⋅2371950773.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39618994279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39618994879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67252 + ... + 289414.

It is an arithmetic number, because the mean of its divisors is an integer number (9904848694).

Almost surely, 2^39618994279 is an apocalyptic number.

39618994279 is a deficient number, since it is larger than the sum of its proper divisors (400497).

39618994279 is a wasteful number, since it uses less digits than its factorization.

39618994279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400496.

The product of its digits is 52907904, while the sum is 67.

The spelling of 39618994279 in words is "thirty-nine billion, six hundred eighteen million, nine hundred ninety-four thousand, two hundred seventy-nine".