12640737 has 8 divisors (see below), whose sum is σ = 16883104. Its totient is φ = 8412768.

The previous prime is 12640709. The next prime is 12640763. The reversal of 12640737 is 73704621.

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

It is not a de Polignac number, because 12640737 - 2⁷ = 12640609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12640037) 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, 1348 + ... + 5205.

It is an arithmetic number, because the mean of its divisors is an integer number (2110388).

Almost surely, 2^12640737 is an apocalyptic number.

It is an amenable number.

12640737 is a deficient number, since it is larger than the sum of its proper divisors (4242367).

12640737 is an equidigital number, since it uses as much as digits as its factorization.

12640737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7199.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 12640737 is about 3555.3814141383. The cubic root of 12640737 is about 232.9471842072.

The spelling of 12640737 in words is "twelve million, six hundred forty thousand, seven hundred thirty-seven".