12649749 has 16 divisors (see below), whose sum is σ = 19396608. Its totient is φ = 7183152.

The previous prime is 12649733. The next prime is 12649757. The reversal of 12649749 is 94794621.

It is not a de Polignac number, because 12649749 - 2⁴ = 12649733 is a prime.

It is a super-2 number, since 2×12649749² = 320032299526002, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12649749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12649709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1704 + ... + 5310.

It is an arithmetic number, because the mean of its divisors is an integer number (1212288).

Almost surely, 2^12649749 is an apocalyptic number.

It is an amenable number.

12649749 is a deficient number, since it is larger than the sum of its proper divisors (6746859).

12649749 is a wasteful number, since it uses less digits than its factorization.

12649749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3784.

The product of its digits is 108864, while the sum is 42.

The square root of 12649749 is about 3556.6485629030. The cubic root of 12649749 is about 233.0025296440.

The spelling of 12649749 in words is "twelve million, six hundred forty-nine thousand, seven hundred forty-nine".