394574812369 has 4 divisors (see below), whose sum is σ = 394577920240. Its totient is φ = 394571704500.

The previous prime is 394574812327. The next prime is 394574812417. The reversal of 394574812369 is 963218475493.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 963218475493 = 903449 ⋅1066157.

It is a cyclic number.

It is not a de Polignac number, because 394574812369 - 2²¹ = 394572715217 is a prime.

It is a super-2 number, since 2×394574812369² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394574818369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1355007 + ... + 1620244.

It is an arithmetic number, because the mean of its divisors is an integer number (98644480060).

Almost surely, 2^394574812369 is an apocalyptic number.

It is an amenable number.

394574812369 is a deficient number, since it is larger than the sum of its proper divisors (3107871).

394574812369 is a wasteful number, since it uses less digits than its factorization.

394574812369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3107870.

The product of its digits is 39191040, while the sum is 61.

The spelling of 394574812369 in words is "three hundred ninety-four billion, five hundred seventy-four million, eight hundred twelve thousand, three hundred sixty-nine".