1252397865 has 16 divisors (see below), whose sum is σ = 2004401088. Its totient is φ = 667757376.

The previous prime is 1252397831. The next prime is 1252397891. The reversal of 1252397865 is 5687932521.

It is not a de Polignac number, because 1252397865 - 2⁶ = 1252397801 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55774 + ... + 74936.

It is an arithmetic number, because the mean of its divisors is an integer number (125275068).

Almost surely, 2^1252397865 is an apocalyptic number.

1252397865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1252397865 is a deficient number, since it is larger than the sum of its proper divisors (752003223).

1252397865 is a wasteful number, since it uses less digits than its factorization.

1252397865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23528.

The product of its digits is 907200, while the sum is 48.

The square root of 1252397865 is about 35389.2337441771. The cubic root of 1252397865 is about 1077.9057108462.

The spelling of 1252397865 in words is "one billion, two hundred fifty-two million, three hundred ninety-seven thousand, eight hundred sixty-five".