391448479 has 16 divisors (see below), whose sum is σ = 407721600. Its totient is φ = 375570720.

The previous prime is 391448471. The next prime is 391448483. The reversal of 391448479 is 974844193.

It is a cyclic number.

It is not a de Polignac number, because 391448479 - 2³ = 391448471 is a prime.

It is a super-2 number, since 2×391448479² = 306463823422826882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391448471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 685264 + ... + 685834.

It is an arithmetic number, because the mean of its divisors is an integer number (25482600).

Almost surely, 2^391448479 is an apocalyptic number.

391448479 is a deficient number, since it is larger than the sum of its proper divisors (16273121).

391448479 is a wasteful number, since it uses less digits than its factorization.

391448479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870.

The product of its digits is 870912, while the sum is 49.

The square root of 391448479 is about 19785.0569622632. The cubic root of 391448479 is about 731.5177523492.

The spelling of 391448479 in words is "three hundred ninety-one million, four hundred forty-eight thousand, four hundred seventy-nine".