439318421721 has 27 divisors (see below), whose sum is σ = 655793426613. Its totient is φ = 283391471160.

The previous prime is 439318421719. The next prime is 439318421741. The reversal of 439318421721 is 127124813934.

The square root of 439318421721 is 662811.

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

439318421721 is a `hidden beast` number, since 439 + 3 + 1 + 8 + 42 + 172 + 1 = 666.

It is not a de Polignac number, because 439318421721 - 2¹ = 439318421719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (439318421741) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 61637860 + ... + 61644986.

Almost surely, 2^439318421721 is an apocalyptic number.

439318421721 is the 662811-st square number.

439318421721 is the 331406-th centered octagonal number.

It is an amenable number.

439318421721 is a deficient number, since it is larger than the sum of its proper divisors (216475004892).

439318421721 is an frugal number, since it uses more digits than its factorization.

439318421721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14322 (or 7161 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The spelling of 439318421721 in words is "four hundred thirty-nine billion, three hundred eighteen million, four hundred twenty-one thousand, seven hundred twenty-one".