391100472 has 96 divisors (see below), whose sum is σ = 1213380480. Its totient is φ = 111481920.

The previous prime is 391100461. The next prime is 391100477. The reversal of 391100472 is 274001193.

391100472 is a `hidden beast` number, since 3 + 91 + 100 + 472 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391100477) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 347703 + ... + 348825.

It is an arithmetic number, because the mean of its divisors is an integer number (12639380).

Almost surely, 2^391100472 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 391100472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (606690240).

391100472 is an abundant number, since it is smaller than the sum of its proper divisors (822280008).

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

391100472 is a wasteful number, since it uses less digits than its factorization.

391100472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1833 (or 1826 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 391100472 is about 19776.2603138207. The cubic root of 391100472 is about 731.3009091885.

The spelling of 391100472 in words is "three hundred ninety-one million, one hundred thousand, four hundred seventy-two".