394564319919 has 48 divisors (see below), whose sum is σ = 711223418880. Its totient is φ = 204776354880.

The previous prime is 394564319911. The next prime is 394564319951. The reversal of 394564319919 is 919913465493.

394564319919 is a `hidden beast` number, since 39 + 4 + 564 + 31 + 9 + 9 + 1 + 9 = 666.

It is not a de Polignac number, because 394564319919 - 2³ = 394564319911 is a prime.

It is a super-2 number, since 2×394564319919² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394564319911) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 474514 + ... + 1007120.

It is an arithmetic number, because the mean of its divisors is an integer number (14817154560).

Almost surely, 2^394564319919 is an apocalyptic number.

394564319919 is a deficient number, since it is larger than the sum of its proper divisors (316659098961).

394564319919 is a wasteful number, since it uses less digits than its factorization.

394564319919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533700 (or 533697 counting only the distinct ones).

The product of its digits is 28343520, while the sum is 63.

The spelling of 394564319919 in words is "three hundred ninety-four billion, five hundred sixty-four million, three hundred nineteen thousand, nine hundred nineteen".