394023631680 has 560 divisors, whose sum is σ = 1640941860096. Its totient is φ = 87864238080.

The previous prime is 394023631669. The next prime is 394023631741. The reversal of 394023631680 is 86136320493.

394023631680 is a `hidden beast` number, since 3 + 9 + 4 + 0 + 2 + 3 + 631 + 6 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (560).

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 79 ways as a sum of consecutive naturals, for example, 7412557 + ... + 7465523.

Almost surely, 2^394023631680 is an apocalyptic number.

394023631680 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 394023631680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (820470930048).

394023631680 is an abundant number, since it is smaller than the sum of its proper divisors (1246918228416).

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

394023631680 is a wasteful number, since it uses less digits than its factorization.

394023631680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53044 (or 53025 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 45.

The spelling of 394023631680 in words is "three hundred ninety-four billion, twenty-three million, six hundred thirty-one thousand, six hundred eighty".