391311420 has 96 divisors (see below), whose sum is σ = 1154829312. Its totient is φ = 98807808.

The previous prime is 391311407. The next prime is 391311433. The reversal of 391311420 is 24113193.

It is an interprime number because it is at equal distance from previous prime (391311407) and next prime (391311433).

It is a congruent number.

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, 140764 + ... + 143516.

It is an arithmetic number, because the mean of its divisors is an integer number (12029472).

Almost surely, 2^391311420 is an apocalyptic number.

391311420 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 391311420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (577414656).

391311420 is an abundant number, since it is smaller than the sum of its proper divisors (763517892).

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

391311420 is a wasteful number, since it uses less digits than its factorization.

391311420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2891 (or 2889 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 391311420 is about 19781.5929591123. The cubic root of 391311420 is about 731.4323662334.

The spelling of 391311420 in words is "three hundred ninety-one million, three hundred eleven thousand, four hundred twenty".