12699809 has 8 divisors (see below), whose sum is σ = 13596000. Its totient is φ = 11826432.

The previous prime is 12699787. The next prime is 12699811. The reversal of 12699809 is 90899621.

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

It is not a de Polignac number, because 12699809 - 2¹² = 12695713 is a prime.

It is a super-2 number, since 2×12699809² = 322570297272962, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12699809.

It is not an unprimeable number, because it can be changed into a prime (12699829) 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, 4544 + ... + 6785.

It is an arithmetic number, because the mean of its divisors is an integer number (1699500).

Almost surely, 2^12699809 is an apocalyptic number.

12699809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12699809 is a deficient number, since it is larger than the sum of its proper divisors (896191).

12699809 is a wasteful number, since it uses less digits than its factorization.

12699809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11407.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 12699809 is about 3563.6791381941. The cubic root of 12699809 is about 233.3094857714.

The spelling of 12699809 in words is "twelve million, six hundred ninety-nine thousand, eight hundred nine".