391948713 has 40 divisors (see below), whose sum is σ = 632709000. Its totient is φ = 240371712.

The previous prime is 391948693. The next prime is 391948723. The reversal of 391948713 is 317849193.

It can be written as a sum of positive squares in 4 ways, for example, as 32353344 + 359595369 = 5688^2 + 18963^2 .

It is not a de Polignac number, because 391948713 - 2⁶ = 391948649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (391948723) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 472383 + ... + 473211.

It is an arithmetic number, because the mean of its divisors is an integer number (15817725).

Almost surely, 2^391948713 is an apocalyptic number.

It is an amenable number.

391948713 is a deficient number, since it is larger than the sum of its proper divisors (240760287).

391948713 is a wasteful number, since it uses less digits than its factorization.

391948713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1303 (or 1294 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 391948713 is about 19797.6946385179. The cubic root of 391948713 is about 731.8292231275.

The spelling of 391948713 in words is "three hundred ninety-one million, nine hundred forty-eight thousand, seven hundred thirteen".