12969721 has 8 divisors (see below), whose sum is σ = 13406400. Its totient is φ = 12537648.

The previous prime is 12969709. The next prime is 12969731. The reversal of 12969721 is 12796921.

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

It is a cyclic number.

It is not a de Polignac number, because 12969721 - 2¹⁷ = 12838649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12969731) 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, 5130 + ... + 7228.

It is an arithmetic number, because the mean of its divisors is an integer number (1675800).

Almost surely, 2^12969721 is an apocalyptic number.

It is an amenable number.

12969721 is a deficient number, since it is larger than the sum of its proper divisors (436679).

12969721 is a wasteful number, since it uses less digits than its factorization.

12969721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2303.

The product of its digits is 13608, while the sum is 37.

The square root of 12969721 is about 3601.3498858067. The cubic root of 12969721 is about 234.9507728486.

The spelling of 12969721 in words is "twelve million, nine hundred sixty-nine thousand, seven hundred twenty-one".