391959672 has 96 divisors (see below), whose sum is σ = 1087415280. Its totient is φ = 117611520.

The previous prime is 391959661. The next prime is 391959697. The reversal of 391959672 is 276959193.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 165118 + ... + 167474.

Almost surely, 2^391959672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391959672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (543707640).

391959672 is an abundant number, since it is smaller than the sum of its proper divisors (695455608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

391959672 is a wasteful number, since it uses less digits than its factorization.

391959672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2433 (or 2416 counting only the distinct ones).

The product of its digits is 918540, while the sum is 51.

The square root of 391959672 is about 19797.9714112330. The cubic root of 391959672 is about 731.8360437832.

The spelling of 391959672 in words is "three hundred ninety-one million, nine hundred fifty-nine thousand, six hundred seventy-two".