391248963 has 12 divisors (see below), whose sum is σ = 645871408. Its totient is φ = 223570800.

The previous prime is 391248961. The next prime is 391248971. The reversal of 391248963 is 369842193.

It is a happy number.

It is not a de Polignac number, because 391248963 - 2¹ = 391248961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (391248961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3105088 + ... + 3105213.

Almost surely, 2^391248963 is an apocalyptic number.

391248963 is a deficient number, since it is larger than the sum of its proper divisors (254622445).

391248963 is a wasteful number, since it uses less digits than its factorization.

391248963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6210314 (or 6210311 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 391248963 is about 19780.0142315419. The cubic root of 391248963 is about 731.3934496573.

The spelling of 391248963 in words is "three hundred ninety-one million, two hundred forty-eight thousand, nine hundred sixty-three".