391970880 has 224 divisors, whose sum is σ = 1580570880. Its totient is φ = 89579520.

The previous prime is 391970879. The next prime is 391970911. The reversal of 391970880 is 88079193.

It is a tau number, because it is divible by the number of its divisors (224).

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

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, 57240 + ... + 63720.

It is an arithmetic number, because the mean of its divisors is an integer number (7056120).

Almost surely, 2^391970880 is an apocalyptic number.

391970880 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 391970880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (790285440).

391970880 is an abundant number, since it is smaller than the sum of its proper divisors (1188600000).

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

391970880 is a wasteful number, since it uses less digits than its factorization.

391970880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6514 (or 6498 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 391970880 is about 19798.2544685131. The cubic root of 391970880 is about 731.8430192799.

The spelling of 391970880 in words is "three hundred ninety-one million, nine hundred seventy thousand, eight hundred eighty".