12749669 has 4 divisors (see below), whose sum is σ = 12924396. Its totient is φ = 12574944.

The previous prime is 12749663. The next prime is 12749689. The reversal of 12749669 is 96694721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2265025 + 10484644 = 1505^2 + 3238^2 .

It is a cyclic number.

It is not a de Polignac number, because 12749669 - 2⁸ = 12749413 is a prime.

It is a super-2 number, since 2×12749669² = 325108119219122, 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 (12749663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87254 + ... + 87399.

It is an arithmetic number, because the mean of its divisors is an integer number (3231099).

Almost surely, 2^12749669 is an apocalyptic number.

It is an amenable number.

12749669 is a deficient number, since it is larger than the sum of its proper divisors (174727).

12749669 is an equidigital number, since it uses as much as digits as its factorization.

12749669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174726.

The product of its digits is 163296, while the sum is 44.

The square root of 12749669 is about 3570.6678646998. The cubic root of 12749669 is about 233.6144147783.

The spelling of 12749669 in words is "twelve million, seven hundred forty-nine thousand, six hundred sixty-nine".