391404731023680 has 896 divisors, whose sum is σ = 1419327642009600. Its totient is φ = 90519905894400.

The previous prime is 391404731023673. The next prime is 391404731023687. The reversal of 391404731023680 is 86320137404193.

It is an interprime number because it is at equal distance from previous prime (391404731023673) and next prime (391404731023687).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391404731023687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 68800266276 + ... + 68800271964.

Almost surely, 2^{391404731023680} is an apocalyptic number.

391404731023680 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 391404731023680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (709663821004800).

391404731023680 is an abundant number, since it is smaller than the sum of its proper divisors (1027922910985920).

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

391404731023680 is a wasteful number, since it uses less digits than its factorization.

391404731023680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8703 (or 8693 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 51.

The spelling of 391404731023680 in words is "three hundred ninety-one trillion, four hundred four billion, seven hundred thirty-one million, twenty-three thousand, six hundred eighty".