12909731 has 4 divisors (see below), whose sum is σ = 13128600. Its totient is φ = 12690864.

The previous prime is 12909709. The next prime is 12909751. The reversal of 12909731 is 13790921.

12909731 = T₂₉₀ + T₂₉₁ + ... + T₄₆₆.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13790921 = 29 ⋅475549.

It is a cyclic number.

It is not a de Polignac number, because 12909731 - 2⁶ = 12909667 is a prime.

It is a super-2 number, since 2×12909731² = 333322308984722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12909751) 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 3 ways as a sum of consecutive naturals, for example, 109346 + ... + 109463.

It is an arithmetic number, because the mean of its divisors is an integer number (3282150).

Almost surely, 2^12909731 is an apocalyptic number.

12909731 is a deficient number, since it is larger than the sum of its proper divisors (218869).

12909731 is an equidigital number, since it uses as much as digits as its factorization.

12909731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218868.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 12909731 is about 3593.0114110590. The cubic root of 12909731 is about 234.5879666883.

The spelling of 12909731 in words is "twelve million, nine hundred nine thousand, seven hundred thirty-one".