394471869 has 32 divisors (see below), whose sum is σ = 596090880. Its totient is φ = 229876800.

The previous prime is 394471867. The next prime is 394471967. The reversal of 394471869 is 968174493.

It is not a de Polignac number, because 394471869 - 2¹ = 394471867 is a prime.

It is a super-2 number, since 2×394471869² = 311216110864706322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394471867) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 169687 + ... + 171995.

It is an arithmetic number, because the mean of its divisors is an integer number (18627840).

Almost surely, 2^394471869 is an apocalyptic number.

It is an amenable number.

394471869 is a deficient number, since it is larger than the sum of its proper divisors (201619011).

394471869 is a wasteful number, since it uses less digits than its factorization.

394471869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2521.

The product of its digits is 1306368, while the sum is 51.

The square root of 394471869 is about 19861.3158929614. The cubic root of 394471869 is about 733.3962403106.

The spelling of 394471869 in words is "three hundred ninety-four million, four hundred seventy-one thousand, eight hundred sixty-nine".