391960974240 has 768 divisors, whose sum is σ = 1605264998400. Its totient is φ = 88310476800.

The previous prime is 391960974211. The next prime is 391960974241. The reversal of 391960974240 is 42479069193.

391960974240 is a `hidden beast` number, since 3 + 9 + 1 + 9 + 609 + 7 + 4 + 24 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (391960974241) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 47848545 + ... + 47856735.

It is an arithmetic number, because the mean of its divisors is an integer number (2090188800).

Almost surely, 2^391960974240 is an apocalyptic number.

391960974240 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 391960974240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (802632499200).

391960974240 is an abundant number, since it is smaller than the sum of its proper divisors (1213304024160).

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

391960974240 is a wasteful number, since it uses less digits than its factorization.

391960974240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8298 (or 8284 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 54.

The spelling of 391960974240 in words is "three hundred ninety-one billion, nine hundred sixty million, nine hundred seventy-four thousand, two hundred forty".