12749989 has 4 divisors (see below), whose sum is σ = 14571424. Its totient is φ = 10928556.

The previous prime is 12749953. The next prime is 12750011. The reversal of 12749989 is 98994721.

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.

It is a cyclic number.

It is not a de Polignac number, because 12749989 - 2⁷ = 12749861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12749189) 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, 910707 + ... + 910720.

It is an arithmetic number, because the mean of its divisors is an integer number (3642856).

Almost surely, 2^12749989 is an apocalyptic number.

It is an amenable number.

12749989 is a deficient number, since it is larger than the sum of its proper divisors (1821435).

12749989 is an equidigital number, since it uses as much as digits as its factorization.

12749989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821434.

The product of its digits is 326592, while the sum is 49.

The square root of 12749989 is about 3570.7126739630. The cubic root of 12749989 is about 233.6163692339.

The spelling of 12749989 in words is "twelve million, seven hundred forty-nine thousand, nine hundred eighty-nine".