12638242 has 16 divisors (see below), whose sum is σ = 20151072. Its totient is φ = 5924160.

The previous prime is 12638239. The next prime is 12638243. The reversal of 12638242 is 24283621.

It is a self number, because there is not a number n which added to its sum of digits gives 12638242.

It is not an unprimeable number, because it can be changed into a prime (12638243) 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, 10693 + ... + 11815.

It is an arithmetic number, because the mean of its divisors is an integer number (1259442).

Almost surely, 2^12638242 is an apocalyptic number.

12638242 is a deficient number, since it is larger than the sum of its proper divisors (7512830).

12638242 is a wasteful number, since it uses less digits than its factorization.

12638242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473.

The product of its digits is 4608, while the sum is 28.

The square root of 12638242 is about 3555.0305202628. The cubic root of 12638242 is about 232.9318570032.

It can be divided in two parts, 12638 and 242, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 12638242 in words is "twelve million, six hundred thirty-eight thousand, two hundred forty-two".