391965479 has 8 divisors (see below), whose sum is σ = 405712560. Its totient is φ = 378233856.

The previous prime is 391965467. The next prime is 391965487. The reversal of 391965479 is 974569193.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 391965479 - 2⁴ = 391965463 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 391965479.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391965439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76007 + ... + 80999.

It is an arithmetic number, because the mean of its divisors is an integer number (50714070).

Almost surely, 2^391965479 is an apocalyptic number.

391965479 is a deficient number, since it is larger than the sum of its proper divisors (13747081).

391965479 is a wasteful number, since it uses less digits than its factorization.

391965479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7729.

The product of its digits is 1837080, while the sum is 53.

The square root of 391965479 is about 19798.1180671295. The cubic root of 391965479 is about 731.8396578888.

The spelling of 391965479 in words is "three hundred ninety-one million, nine hundred sixty-five thousand, four hundred seventy-nine".