391961560086 has 240 divisors, whose sum is σ = 1008719355600. Its totient is φ = 113338248192.

The previous prime is 391961560043. The next prime is 391961560099. The reversal of 391961560086 is 680065169193.

391961560086 is a `hidden beast` number, since 3 + 9 + 19 + 6 + 15 + 600 + 8 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 32907100 + ... + 32919008.

It is an arithmetic number, because the mean of its divisors is an integer number (4202997315).

Almost surely, 2^391961560086 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391961560086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (504359677800).

391961560086 is an abundant number, since it is smaller than the sum of its proper divisors (616757795514).

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

391961560086 is a wasteful number, since it uses less digits than its factorization.

391961560086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12013 (or 11987 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The spelling of 391961560086 in words is "three hundred ninety-one billion, nine hundred sixty-one million, five hundred sixty thousand, eighty-six".