439279681 has 3 divisors (see below), whose sum is σ = 439300641. Its totient is φ = 439258722.

The previous prime is 439279679. The next prime is 439279693. The reversal of 439279681 is 186972934.

The square root of 439279681 is 20959.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 439279681 - 2¹ = 439279679 is a prime.

It is a super-2 number, since 2×439279681² = 385933276278923522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (439279661) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 10480 + ... + 31438.

It is an arithmetic number, because the mean of its divisors is an integer number (146433547).

Almost surely, 2^439279681 is an apocalyptic number.

439279681 is the 20959-th square number.

439279681 is the 10480-th centered octagonal number.

It is an amenable number.

439279681 is a deficient number, since it is larger than the sum of its proper divisors (20960).

439279681 is an frugal number, since it uses more digits than its factorization.

439279681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41918 (or 20959 counting only the distinct ones).

The product of its digits is 653184, while the sum is 49.

The cubic root of 439279681 is about 760.1752141036.

Multiplying 439279681 by its sum of digits (49), we get a square (21524704369 = 146713²).

The spelling of 439279681 in words is "four hundred thirty-nine million, two hundred seventy-nine thousand, six hundred eighty-one".