639230089 has 9 divisors (see below), whose sum is σ = 647501799. Its totient is φ = 631063680.

The previous prime is 639230083. The next prime is 639230113. The reversal of 639230089 is 980032936.

The square root of 639230089 is 25283.

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

It can be written as a sum of positive squares in only one way, i.e., 154878025 + 484352064 = 12445^2 + 22008^2 .

It is not a de Polignac number, because 639230089 - 2¹¹ = 639228041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639230083) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3311977 + ... + 3312169.

Almost surely, 2^639230089 is an apocalyptic number.

639230089 is the 25283-rd square number.

639230089 is the 12642-nd centered octagonal number.

It is an amenable number.

639230089 is a deficient number, since it is larger than the sum of its proper divisors (8271710).

639230089 is an frugal number, since it uses more digits than its factorization.

639230089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648 (or 324 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 40.

The cubic root of 639230089 is about 861.4281700645.

It can be divided in two parts, 6392 and 30089, that added together give a square (36481 = 191²).

The spelling of 639230089 in words is "six hundred thirty-nine million, two hundred thirty thousand, eighty-nine".