391147968 has 112 divisors (see below), whose sum is σ = 1102217760. Its totient is φ = 121995264.

The previous prime is 391147961. The next prime is 391148011. The reversal of 391147968 is 869741193.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391147961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 956148 + ... + 956556.

It is an arithmetic number, because the mean of its divisors is an integer number (9841230).

Almost surely, 2^391147968 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 391147968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (551108880).

391147968 is an abundant number, since it is smaller than the sum of its proper divisors (711069792).

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

391147968 is a wasteful number, since it uses less digits than its factorization.

391147968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734 (or 724 counting only the distinct ones).

The product of its digits is 326592, while the sum is 48.

The square root of 391147968 is about 19777.4611110729. The cubic root of 391147968 is about 731.3305115239.

The spelling of 391147968 in words is "three hundred ninety-one million, one hundred forty-seven thousand, nine hundred sixty-eight".