391231360 has 128 divisors (see below), whose sum is σ = 1025589600. Its totient is φ = 141828096.

The previous prime is 391231349. The next prime is 391231381. The reversal of 391231360 is 63132193.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-3 number, since 3×391231360³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 490482 + ... + 491278.

Almost surely, 2^391231360 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 391231360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (512794800).

391231360 is an abundant number, since it is smaller than the sum of its proper divisors (634358240).

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

391231360 is a wasteful number, since it uses less digits than its factorization.

391231360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888 (or 876 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 391231360 is about 19779.5692571906. The cubic root of 391231360 is about 731.3824805871.

The spelling of 391231360 in words is "three hundred ninety-one million, two hundred thirty-one thousand, three hundred sixty".