391979200345 has 4 divisors (see below), whose sum is σ = 470375040420. Its totient is φ = 313583360272.

The previous prime is 391979200331. The next prime is 391979200369. The reversal of 391979200345 is 543002979193.

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 2 ways, for example, as 203606707984 + 188372492361 = 451228^2 + 434019^2 .

It is a cyclic number.

It is not a de Polignac number, because 391979200345 - 2³¹ = 389831716697 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 391979200292 and 391979200301.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39197920030 + ... + 39197920039.

It is an arithmetic number, because the mean of its divisors is an integer number (117593760105).

Almost surely, 2^391979200345 is an apocalyptic number.

It is an amenable number.

391979200345 is a deficient number, since it is larger than the sum of its proper divisors (78395840075).

391979200345 is an equidigital number, since it uses as much as digits as its factorization.

391979200345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78395840074.

The product of its (nonzero) digits is 1837080, while the sum is 52.

The spelling of 391979200345 in words is "three hundred ninety-one billion, nine hundred seventy-nine million, two hundred thousand, three hundred forty-five".