1252388865 has 128 divisors (see below), whose sum is σ = 2549836800. Its totient is φ = 513976320.

The previous prime is 1252388807. The next prime is 1252388869. The reversal of 1252388865 is 5688832521.

It is not a de Polignac number, because 1252388865 - 2⁹ = 1252388353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1252388869) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 14071741 + ... + 14071829.

It is an arithmetic number, because the mean of its divisors is an integer number (19920600).

Almost surely, 2^1252388865 is an apocalyptic number.

1252388865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1252388865 is an abundant number, since it is smaller than the sum of its proper divisors (1297447935).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1252388865 is an equidigital number, since it uses as much as digits as its factorization.

1252388865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204 (or 178 counting only the distinct ones).

The product of its digits is 921600, while the sum is 48.

The square root of 1252388865 is about 35389.1065866320. The cubic root of 1252388865 is about 1077.9031288194.

The spelling of 1252388865 in words is "one billion, two hundred fifty-two million, three hundred eighty-eight thousand, eight hundred sixty-five".