12749665 has 8 divisors (see below), whose sum is σ = 16104960. Its totient is φ = 9662832.

The previous prime is 12749663. The next prime is 12749689. The reversal of 12749665 is 56694721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12749665 - 2¹ = 12749663 is a prime.

It is a super-2 number, since 2×12749665² = 325107915224450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12749663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67009 + ... + 67198.

It is an arithmetic number, because the mean of its divisors is an integer number (2013120).

Almost surely, 2^12749665 is an apocalyptic number.

It is an amenable number.

12749665 is a deficient number, since it is larger than the sum of its proper divisors (3355295).

12749665 is a wasteful number, since it uses less digits than its factorization.

12749665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134231.

The product of its digits is 90720, while the sum is 40.

The square root of 12749665 is about 3570.6673045805. The cubic root of 12749665 is about 233.6143903474.

The spelling of 12749665 in words is "twelve million, seven hundred forty-nine thousand, six hundred sixty-five".