391299120 has 80 divisors (see below), whose sum is σ = 1347815520. Its totient is φ = 104345856.

The previous prime is 391299119. The next prime is 391299127. The reversal of 391299120 is 21992193.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (391299127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88419 + ... + 92738.

It is an arithmetic number, because the mean of its divisors is an integer number (16847694).

Almost surely, 2^391299120 is an apocalyptic number.

391299120 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

391299120 is an abundant number, since it is smaller than the sum of its proper divisors (956516400).

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

391299120 is a wasteful number, since it uses less digits than its factorization.

391299120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181179 (or 181167 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 391299120 is about 19781.2820615854. The cubic root of 391299120 is about 731.4247025058.

The spelling of 391299120 in words is "three hundred ninety-one million, two hundred ninety-nine thousand, one hundred twenty".