391344336 has 120 divisors (see below), whose sum is σ = 1121178240. Its totient is φ = 127400448.

The previous prime is 391344329. The next prime is 391344347. The reversal of 391344336 is 633443193.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 391344336.

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, 1637305 + ... + 1637543.

It is an arithmetic number, because the mean of its divisors is an integer number (9343152).

Almost surely, 2^391344336 is an apocalyptic number.

391344336 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391344336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (560589120).

391344336 is an abundant number, since it is smaller than the sum of its proper divisors (729833904).

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

391344336 is a wasteful number, since it uses less digits than its factorization.

391344336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473 (or 464 counting only the distinct ones).

The product of its digits is 69984, while the sum is 36.

The square root of 391344336 is about 19782.4249271923. The cubic root of 391344336 is about 731.4528743262.

The spelling of 391344336 in words is "three hundred ninety-one million, three hundred forty-four thousand, three hundred thirty-six".