18321412 has 12 divisors (see below), whose sum is σ = 32098780. Its totient is φ = 9150336.

The previous prime is 18321389. The next prime is 18321419. The reversal of 18321412 is 21412381.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4955076 + 13366336 = 2226^2 + 3656^2 .

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18321419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2488 + ... + 6544.

Almost surely, 2^18321412 is an apocalyptic number.

It is an amenable number.

18321412 is a deficient number, since it is larger than the sum of its proper divisors (13777368).

18321412 is a wasteful number, since it uses less digits than its factorization.

18321412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5190 (or 5188 counting only the distinct ones).

The product of its digits is 384, while the sum is 22.

The square root of 18321412 is about 4280.3518546961. The cubic root of 18321412 is about 263.6248305840.

Adding to 18321412 its reverse (21412381), we get a palindrome (39733793).

The spelling of 18321412 in words is "eighteen million, three hundred twenty-one thousand, four hundred twelve".