394131584401 has 3 divisors (see below), whose sum is σ = 394132212201. Its totient is φ = 394130956602.

The previous prime is 394131584383. The next prime is 394131584437. The reversal of 394131584401 is 104485131493.

It is a happy number.

The square root of 394131584401 is 627799.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 394131584401 - 2⁵ = 394131584369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394131584491) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 313900 + ... + 941698.

It is an arithmetic number, because the mean of its divisors is an integer number (131377404067).

Almost surely, 2^394131584401 is an apocalyptic number.

394131584401 is the 627799-th square number.

394131584401 is the 313900-th centered octagonal number.

It is an amenable number.

394131584401 is a deficient number, since it is larger than the sum of its proper divisors (627800).

394131584401 is an frugal number, since it uses more digits than its factorization.

394131584401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255598 (or 627799 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 394131584401 in words is "three hundred ninety-four billion, one hundred thirty-one million, five hundred eighty-four thousand, four hundred one".