394647969 has 4 divisors (see below), whose sum is σ = 526197296. Its totient is φ = 263098644.

The previous prime is 394647941. The next prime is 394647977. The reversal of 394647969 is 969746493.

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.

It is not a de Polignac number, because 394647969 - 2²⁷ = 260430241 is a prime.

It is a super-2 number, since 2×394647969² = 311494038871649922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394647989) 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, 65774659 + ... + 65774664.

It is an arithmetic number, because the mean of its divisors is an integer number (131549324).

Almost surely, 2^394647969 is an apocalyptic number.

It is an amenable number.

394647969 is a deficient number, since it is larger than the sum of its proper divisors (131549327).

394647969 is a wasteful number, since it uses less digits than its factorization.

394647969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131549326.

The product of its digits is 8817984, while the sum is 57.

The square root of 394647969 is about 19865.7486393038. The cubic root of 394647969 is about 733.5053582430.

It can be divided in two parts, 3946 and 47969, that added together give a palindrome (51915).

The spelling of 394647969 in words is "three hundred ninety-four million, six hundred forty-seven thousand, nine hundred sixty-nine".