439023681 has 12 divisors (see below), whose sum is σ = 634541908. Its totient is φ = 292499424.

The previous prime is 439023667. The next prime is 439023703. The reversal of 439023681 is 186320934.

It can be written as a sum of positive squares in 2 ways, for example, as 115347600 + 323676081 = 10740^2 + 17991^2 .

It is not a de Polignac number, because 439023681 - 2⁶ = 439023617 is a prime.

It is a super-2 number, since 2×439023681² = 385483584957579522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (439023631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 831 + ... + 29643.

Almost surely, 2^439023681 is an apocalyptic number.

It is an amenable number.

439023681 is a deficient number, since it is larger than the sum of its proper divisors (195518227).

439023681 is a wasteful number, since it uses less digits than its factorization.

439023681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30512 (or 30509 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 439023681 is about 20952.8919483684. The cubic root of 439023681 is about 760.0275157397.

The spelling of 439023681 in words is "four hundred thirty-nine million, twenty-three thousand, six hundred eighty-one".