12719909 has 4 divisors (see below), whose sum is σ = 12730860. Its totient is φ = 12708960.

The previous prime is 12719891. The next prime is 12719929. The reversal of 12719909 is 90991721.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 12271009 + 448900 = 3503^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 12719909 - 2⁸ = 12719653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12719929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3494 + ... + 6135.

It is an arithmetic number, because the mean of its divisors is an integer number (3182715).

Almost surely, 2^12719909 is an apocalyptic number.

It is an amenable number.

12719909 is a deficient number, since it is larger than the sum of its proper divisors (10951).

12719909 is an equidigital number, since it uses as much as digits as its factorization.

12719909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10950.

The product of its (nonzero) digits is 10206, while the sum is 38.

The square root of 12719909 is about 3566.4981424361. The cubic root of 12719909 is about 233.4325072751.

The spelling of 12719909 in words is "twelve million, seven hundred nineteen thousand, nine hundred nine".