394405937040 has 80 divisors (see below), whose sum is σ = 1255703254848. Its totient is φ = 102332348928.

The previous prime is 394405937033. The next prime is 394405937071. The reversal of 394405937040 is 40739504493.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-3 number, since 3×394405937040³ (a number of 36 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 22198662 + ... + 22216421.

Almost surely, 2^394405937040 is an apocalyptic number.

394405937040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

394405937040 is an abundant number, since it is smaller than the sum of its proper divisors (861297317808).

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

394405937040 is a wasteful number, since it uses less digits than its factorization.

394405937040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44415136 (or 44415130 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 48.

The spelling of 394405937040 in words is "three hundred ninety-four billion, four hundred five million, nine hundred thirty-seven thousand, forty".