1252763989 has 4 divisors (see below), whose sum is σ = 1253112640. Its totient is φ = 1252415340.

The previous prime is 1252763987. The next prime is 1252763999. The reversal of 1252763989 is 9893672521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9893672521 = 1409 ⋅7021769.

It is a cyclic number.

It is not a de Polignac number, because 1252763989 - 2¹ = 1252763987 is a prime.

It is a super-2 number, since 2×1252763989² = 3138835224270384242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252763987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168879 + ... + 176140.

It is an arithmetic number, because the mean of its divisors is an integer number (313278160).

Almost surely, 2^1252763989 is an apocalyptic number.

It is an amenable number.

1252763989 is a deficient number, since it is larger than the sum of its proper divisors (348651).

1252763989 is an equidigital number, since it uses as much as digits as its factorization.

1252763989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348650.

The product of its digits is 1632960, while the sum is 52.

The square root of 1252763989 is about 35394.4061823334. The cubic root of 1252763989 is about 1078.0107383594.

The spelling of 1252763989 in words is "one billion, two hundred fifty-two million, seven hundred sixty-three thousand, nine hundred eighty-nine".