394169189 has 4 divisors (see below), whose sum is σ = 407761260. Its totient is φ = 380577120.

The previous prime is 394169141. The next prime is 394169201. The reversal of 394169189 is 981961493.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 199092100 + 195077089 = 14110^2 + 13967^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394169189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394169689) 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, 6795992 + ... + 6796049.

It is an arithmetic number, because the mean of its divisors is an integer number (101940315).

Almost surely, 2^394169189 is an apocalyptic number.

It is an amenable number.

394169189 is a deficient number, since it is larger than the sum of its proper divisors (13592071).

394169189 is a wasteful number, since it uses less digits than its factorization.

394169189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13592070.

The product of its digits is 419904, while the sum is 50.

The square root of 394169189 is about 19853.6945931985. The cubic root of 394169189 is about 733.2086129264.

The spelling of 394169189 in words is "three hundred ninety-four million, one hundred sixty-nine thousand, one hundred eighty-nine".