391304880 has 120 divisors (see below), whose sum is σ = 1324058112. Its totient is φ = 103560192.

The previous prime is 391304863. The next prime is 391304897. The reversal of 391304880 is 88403193.

It is an interprime number because it is at equal distance from previous prime (391304863) and next prime (391304897).

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×391304880² = 306239018223628800, which contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 96657 + ... + 100623.

Almost surely, 2^391304880 is an apocalyptic number.

391304880 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 391304880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (662029056).

391304880 is an abundant number, since it is smaller than the sum of its proper divisors (932753232).

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

391304880 is a wasteful number, since it uses less digits than its factorization.

391304880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4123 (or 4114 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 391304880 is about 19781.4276532307. The cubic root of 391304880 is about 731.4282913934.

The spelling of 391304880 in words is "three hundred ninety-one million, three hundred four thousand, eight hundred eighty".