391979200346 has 4 divisors (see below), whose sum is σ = 587968800522. Its totient is φ = 195989600172.

The previous prime is 391979200331. The next prime is 391979200369. The reversal of 391979200346 is 643002979193.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 378624855625 + 13354344721 = 615325^2 + 115561^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97994800085 + ... + 97994800088.

Almost surely, 2^391979200346 is an apocalyptic number.

391979200346 is a deficient number, since it is larger than the sum of its proper divisors (195989600176).

391979200346 is a wasteful number, since it uses less digits than its factorization.

391979200346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195989600175.

The product of its (nonzero) digits is 2204496, while the sum is 53.

The spelling of 391979200346 in words is "three hundred ninety-one billion, nine hundred seventy-nine million, two hundred thousand, three hundred forty-six".