12699649 has 4 divisors (see below), whose sum is σ = 12889264. Its totient is φ = 12510036.

The previous prime is 12699641. The next prime is 12699667. The reversal of 12699649 is 94699621.

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 12699649 - 2³ = 12699641 is a prime.

It is a super-2 number, since 2×12699649² = 322562169446402, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12699599 and 12699608.

It is not an unprimeable number, because it can be changed into a prime (12699641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94707 + ... + 94840.

It is an arithmetic number, because the mean of its divisors is an integer number (3222316).

Almost surely, 2^12699649 is an apocalyptic number.

It is an amenable number.

12699649 is a deficient number, since it is larger than the sum of its proper divisors (189615).

12699649 is an equidigital number, since it uses as much as digits as its factorization.

12699649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189614.

The product of its digits is 209952, while the sum is 46.

The square root of 12699649 is about 3563.6566894133. The cubic root of 12699649 is about 233.3085059752.

The spelling of 12699649 in words is "twelve million, six hundred ninety-nine thousand, six hundred forty-nine".