391948694 has 4 divisors (see below), whose sum is σ = 587923044. Its totient is φ = 195974346.

The previous prime is 391948693. The next prime is 391948723. The reversal of 391948694 is 496849193.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 496849193 = 41 ⋅12118273.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391948693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97987172 + ... + 97987175.

It is an arithmetic number, because the mean of its divisors is an integer number (146980761).

Almost surely, 2^391948694 is an apocalyptic number.

391948694 is a deficient number, since it is larger than the sum of its proper divisors (195974350).

391948694 is a wasteful number, since it uses less digits than its factorization.

391948694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195974349.

The product of its digits is 1679616, while the sum is 53.

The square root of 391948694 is about 19797.6941586640. The cubic root of 391948694 is about 731.8292113022.

The spelling of 391948694 in words is "three hundred ninety-one million, nine hundred forty-eight thousand, six hundred ninety-four".