12638722 has 8 divisors (see below), whose sum is σ = 19611900. Its totient is φ = 6101424.

The previous prime is 12638699. The next prime is 12638741. The reversal of 12638722 is 22783621.

It can be written as a sum of positive squares in 2 ways, for example, as 11964681 + 674041 = 3459^2 + 821^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108897 + ... + 109012.

Almost surely, 2^12638722 is an apocalyptic number.

12638722 is a deficient number, since it is larger than the sum of its proper divisors (6973178).

12638722 is a wasteful number, since it uses less digits than its factorization.

12638722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217940.

The product of its digits is 8064, while the sum is 31.

The square root of 12638722 is about 3555.0980295907. The cubic root of 12638722 is about 232.9348058805.

The spelling of 12638722 in words is "twelve million, six hundred thirty-eight thousand, seven hundred twenty-two".