3859515639225 has 135 divisors (see below), whose sum is σ = 7222108605943. Its totient is φ = 2037615384960.

The previous prime is 3859515639181. The next prime is 3859515639247. The reversal of 3859515639225 is 5229365159583.

The square root of 3859515639225 is 1964565.

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

3859515639225 is a `hidden beast` number, since 3 + 8 + 5 + 9 + 515 + 6 + 3 + 92 + 25 = 666.

It can be written as a sum of positive squares in 13 ways, for example, as 2033028260649 + 1826487378576 = 1425843^2 + 1351476^2 .

It is a tau number, because it is divible by the number of its divisors (135).

It is not a de Polignac number, because 3859515639225 - 2¹¹ = 3859515637177 is a prime.

It is a Duffinian number.

Its product of digits (87480000) is a multiple of the sum of its prime divisors (450).

It is an unprimeable number.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 13172408179 + ... + 13172408471.

Almost surely, 2^{3859515639225} is an apocalyptic number.

3859515639225 is the 1964565-th square number.

3859515639225 is the 982283-rd centered octagonal number.

It is an amenable number.

3859515639225 is a deficient number, since it is larger than the sum of its proper divisors (3362592966718).

3859515639225 is an frugal number, since it uses more digits than its factorization.

3859515639225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906 (or 450 counting only the distinct ones).

The product of its digits is 87480000, while the sum is 63.

The spelling of 3859515639225 in words is "three trillion, eight hundred fifty-nine billion, five hundred fifteen million, six hundred thirty-nine thousand, two hundred twenty-five".