1295640025 has 27 divisors (see below), whose sum is σ = 1684865469. Its totient is φ = 988278720.

The previous prime is 1295640011. The next prime is 1295640089. The reversal of 1295640025 is 5200465921.

It is a happy number.

The square root of 1295640025 is 35995.

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

It can be written as a sum of positive squares in 4 ways, for example, as 727866441 + 567773584 = 26979^2 + 23828^2 .

It is not a de Polignac number, because 1295640025 - 2¹¹ = 1295637977 is a prime.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4139269 + ... + 4139581.

Almost surely, 2^1295640025 is an apocalyptic number.

1295640025 is the 35995-th square number.

1295640025 is the 17998-th centered octagonal number.

It is an amenable number.

1295640025 is a deficient number, since it is larger than the sum of its proper divisors (389225444).

1295640025 is an frugal number, since it uses more digits than its factorization.

1295640025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682 (or 341 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The cubic root of 1295640025 is about 1090.1714022183.

The spelling of 1295640025 in words is "one billion, two hundred ninety-five million, six hundred forty thousand, twenty-five".