391438116 has 96 divisors (see below), whose sum is σ = 1072332800. Its totient is φ = 123288480.

The previous prime is 391438097. The next prime is 391438169. The reversal of 391438116 is 611834193.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 142605 + ... + 145323.

Almost surely, 2^391438116 is an apocalyptic number.

391438116 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 391438116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (536166400).

391438116 is an abundant number, since it is smaller than the sum of its proper divisors (680894684).

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

391438116 is a wasteful number, since it uses less digits than its factorization.

391438116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2806 (or 2798 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 391438116 is about 19784.7950709630. The cubic root of 391438116 is about 731.5112970209.

The spelling of 391438116 in words is "three hundred ninety-one million, four hundred thirty-eight thousand, one hundred sixteen".