839944755225 has 27 divisors (see below), whose sum is σ = 1504459007103. Its totient is φ = 447963204240.

The previous prime is 839944755113. The next prime is 839944755229. The reversal of 839944755225 is 522557449938.

The square root of 839944755225 is 916485.

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

839944755225 is a `hidden beast` number, since 8 + 3 + 9 + 94 + 475 + 52 + 25 = 666.

It can be written as a sum of positive squares in only one way, i.e., 302380111881 + 537564643344 = 549891^2 + 733188^2 .

It is not a de Polignac number, because 839944755225 - 2¹¹ = 839944753177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (839944755229) 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, 13716726 + ... + 13777824.

Almost surely, 2^839944755225 is an apocalyptic number.

839944755225 is the 916485-th square number.

839944755225 is the 458243-rd centered octagonal number.

It is an amenable number.

839944755225 is a deficient number, since it is larger than the sum of its proper divisors (664514251878).

839944755225 is an frugal number, since it uses more digits than its factorization.

839944755225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122214 (or 61107 counting only the distinct ones).

The product of its digits is 108864000, while the sum is 63.

It can be divided in two parts, 839944 and 755225, that added together give a square (1595169 = 1263²).

The spelling of 839944755225 in words is "eight hundred thirty-nine billion, nine hundred forty-four million, seven hundred fifty-five thousand, two hundred twenty-five".