394392089505 has 32 divisors (see below), whose sum is σ = 664620364800. Its totient is φ = 199157476032.

The previous prime is 394392089479. The next prime is 394392089521. The reversal of 394392089505 is 505980293493.

It is not a de Polignac number, because 394392089505 - 2²³ = 394383700897 is a prime.

It is a super-2 number, since 2×394392089505² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101836 + ... + 893954.

It is an arithmetic number, because the mean of its divisors is an integer number (20769386400).

Almost surely, 2^394392089505 is an apocalyptic number.

It is an amenable number.

394392089505 is a deficient number, since it is larger than the sum of its proper divisors (270228275295).

394392089505 is a wasteful number, since it uses less digits than its factorization.

394392089505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793893.

The product of its (nonzero) digits is 10497600, while the sum is 57.

The spelling of 394392089505 in words is "three hundred ninety-four billion, three hundred ninety-two million, eighty-nine thousand, five hundred five".