391621706460 has 144 divisors (see below), whose sum is σ = 1200751624800. Its totient is φ = 103305388032.

The previous prime is 391621706447. The next prime is 391621706519. The reversal of 391621706460 is 64607126193.

391621706460 is a `hidden beast` number, since 3 + 9 + 16 + 2 + 170 + 6 + 460 = 666.

391621706460 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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 47 ways as a sum of consecutive naturals, for example, 47644231 + ... + 47652449.

It is an arithmetic number, because the mean of its divisors is an integer number (8338552950).

Almost surely, 2^391621706460 is an apocalyptic number.

391621706460 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 391621706460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (600375812400).

391621706460 is an abundant number, since it is smaller than the sum of its proper divisors (809129918340).

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

391621706460 is a wasteful number, since it uses less digits than its factorization.

391621706460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11060 (or 11055 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The spelling of 391621706460 in words is "three hundred ninety-one billion, six hundred twenty-one million, seven hundred six thousand, four hundred sixty".