439638469 has 2 divisors, whose sum is σ = 439638470. Its totient is φ = 439638468.

The previous prime is 439638443. The next prime is 439638481. The reversal of 439638469 is 964836934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 294122500 + 145515969 = 17150^2 + 12063^2 .

It is a cyclic number.

It is not a de Polignac number, because 439638469 - 2¹³ = 439630277 is a prime.

It is a super-2 number, since 2×439638469² = 386563966849327922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (439638439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219819234 + 219819235.

It is an arithmetic number, because the mean of its divisors is an integer number (219819235).

Almost surely, 2^439638469 is an apocalyptic number.

It is an amenable number.

439638469 is a deficient number, since it is larger than the sum of its proper divisors (1).

439638469 is an equidigital number, since it uses as much as digits as its factorization.

439638469 is an evil number, because the sum of its binary digits is even.

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

The square root of 439638469 is about 20967.5575353926. The cubic root of 439638469 is about 760.3821191308.

The spelling of 439638469 in words is "four hundred thirty-nine million, six hundred thirty-eight thousand, four hundred sixty-nine".