12699609 has 8 divisors (see below), whose sum is σ = 18235392. Its totient is φ = 7815120.

The previous prime is 12699607. The next prime is 12699613. The reversal of 12699609 is 90699621.

It is a happy number.

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

It is not a de Polignac number, because 12699609 - 2¹ = 12699607 is a prime.

It is a super-2 number, since 2×12699609² = 322560137505762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12699601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162777 + ... + 162854.

It is an arithmetic number, because the mean of its divisors is an integer number (2279424).

Almost surely, 2^12699609 is an apocalyptic number.

It is an amenable number.

12699609 is a deficient number, since it is larger than the sum of its proper divisors (5535783).

12699609 is a wasteful number, since it uses less digits than its factorization.

12699609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325647.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 12699609 is about 3563.6510771960. The cubic root of 12699609 is about 233.3082610248.

It can be divided in two parts, 1269 and 9609, that added together give a triangular number (10878 = T₁₄₇).

The spelling of 12699609 in words is "twelve million, six hundred ninety-nine thousand, six hundred nine".