391088880 has 480 divisors, whose sum is σ = 1663893504. Its totient is φ = 80123904.

The previous prime is 391088879. The next prime is 391088891. The reversal of 391088880 is 88880193.

It is a super-3 number, since 3×391088880³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3079377 + ... + 3079503.

Almost surely, 2^391088880 is an apocalyptic number.

391088880 is a gapful number since it is divisible by the number (30) 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 391088880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (831946752).

391088880 is an abundant number, since it is smaller than the sum of its proper divisors (1272804624).

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

391088880 is a wasteful number, since it uses less digits than its factorization.

391088880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 204 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The square root of 391088880 is about 19775.9672329826. The cubic root of 391088880 is about 731.2936840000.

The spelling of 391088880 in words is "three hundred ninety-one million, eighty-eight thousand, eight hundred eighty".