391996080 has 360 divisors, whose sum is σ = 1574524224. Its totient is φ = 87091200.

The previous prime is 391996079. The next prime is 391996097. The reversal of 391996080 is 80699193.

391996080 is a `hidden beast` number, since 39 + 1 + 9 + 9 + 608 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (360).

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 71 ways as a sum of consecutive naturals, for example, 1446345 + ... + 1446615.

Almost surely, 2^391996080 is an apocalyptic number.

391996080 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 391996080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (787262112).

391996080 is an abundant number, since it is smaller than the sum of its proper divisors (1182528144).

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

391996080 is a wasteful number, since it uses less digits than its factorization.

391996080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345 (or 329 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 391996080 is about 19798.8908780265. The cubic root of 391996080 is about 731.8587024593.

It can be divided in two parts, 3919 and 96080, that added together give a palindrome (99999).

The spelling of 391996080 in words is "three hundred ninety-one million, nine hundred ninety-six thousand, eighty".