12291638 has 8 divisors (see below), whose sum is σ = 18458760. Its totient is φ = 6138720.

The previous prime is 12291623. The next prime is 12291641. The reversal of 12291638 is 83619221.

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

It is a congruent number.

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, 1028 + ... + 5063.

It is an arithmetic number, because the mean of its divisors is an integer number (2307345).

Almost surely, 2^12291638 is an apocalyptic number.

12291638 is a deficient number, since it is larger than the sum of its proper divisors (6167122).

12291638 is a wasteful number, since it uses less digits than its factorization.

12291638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7102.

The product of its digits is 5184, while the sum is 32.

The square root of 12291638 is about 3505.9432397003. The cubic root of 12291638 is about 230.7827020227.

It can be divided in two parts, 1229 and 1638, that multiplied together give a palindrome (2013102).

The spelling of 12291638 in words is "twelve million, two hundred ninety-one thousand, six hundred thirty-eight".