391914963338 has 4 divisors (see below), whose sum is σ = 587872445010. Its totient is φ = 195957481668.

The previous prime is 391914963317. The next prime is 391914963343. The reversal of 391914963338 is 833369419193.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 833369419193 = 73 ⋅11416019441.

It can be written as a sum of positive squares in only one way, i.e., 331761024169 + 60153939169 = 575987^2 + 245263^2 .

It is an unprimeable number.

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, 97978740833 + ... + 97978740836.

Almost surely, 2^391914963338 is an apocalyptic number.

391914963338 is a deficient number, since it is larger than the sum of its proper divisors (195957481672).

391914963338 is a wasteful number, since it uses less digits than its factorization.

391914963338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195957481671.

The product of its digits is 11337408, while the sum is 59.

The spelling of 391914963338 in words is "three hundred ninety-one billion, nine hundred fourteen million, nine hundred sixty-three thousand, three hundred thirty-eight".