394364689 has 8 divisors (see below), whose sum is σ = 400406760. Its totient is φ = 388367616.

The previous prime is 394364683. The next prime is 394364713. The reversal of 394364689 is 986463493.

It can be written as a sum of positive squares in 4 ways, for example, as 9891025 + 384473664 = 3145^2 + 19608^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 394364689 - 2³ = 394364681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394364681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6627 + ... + 28855.

It is an arithmetic number, because the mean of its divisors is an integer number (50050845).

Almost surely, 2^394364689 is an apocalyptic number.

It is an amenable number.

394364689 is a deficient number, since it is larger than the sum of its proper divisors (6042071).

394364689 is a wasteful number, since it uses less digits than its factorization.

394364689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22499.

The product of its digits is 3359232, while the sum is 52.

The square root of 394364689 is about 19858.6174997153. The cubic root of 394364689 is about 733.3298118059.

The spelling of 394364689 in words is "three hundred ninety-four million, three hundred sixty-four thousand, six hundred eighty-nine".