1639035225 has 27 divisors (see below), whose sum is σ = 2936782303. Its totient is φ = 873828240.

The previous prime is 1639035197. The next prime is 1639035227. The reversal of 1639035225 is 5225309361.

The square root of 1639035225 is 40485.

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

1639035225 is a `hidden beast` number, since 16 + 390 + 35 + 225 = 666.

It can be written as a sum of positive squares in only one way, i.e., 590052681 + 1048982544 = 24291^2 + 32388^2 .

It is not a de Polignac number, because 1639035225 - 2¹⁷ = 1638904153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1639035225.

It is not an unprimeable number, because it can be changed into a prime (1639035227) 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, 605926 + ... + 608624.

Almost surely, 2^1639035225 is an apocalyptic number.

1639035225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1639035225 is the 40485-th square number.

1639035225 is the 20243-rd centered octagonal number.

It is an amenable number.

1639035225 is a deficient number, since it is larger than the sum of its proper divisors (1297747078).

1639035225 is an frugal number, since it uses more digits than its factorization.

1639035225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5414 (or 2707 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The cubic root of 1639035225 is about 1179.0424159279.

Multiplying 1639035225 by its sum of digits (36), we get a square (59005268100 = 242910²).

It can be divided in two parts, 16390 and 35225, that added together give a palindrome (51615).

The spelling of 1639035225 in words is "one billion, six hundred thirty-nine million, thirty-five thousand, two hundred twenty-five".