18406312 has 16 divisors (see below), whose sum is σ = 35625600. Its totient is φ = 8906160.

The previous prime is 18406229. The next prime is 18406319. The reversal of 18406312 is 21360481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18406319) 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, 36862 + ... + 37357.

It is an arithmetic number, because the mean of its divisors is an integer number (2226600).

Almost surely, 2^18406312 is an apocalyptic number.

It is an amenable number.

18406312 is a deficient number, since it is larger than the sum of its proper divisors (17219288).

18406312 is a wasteful number, since it uses less digits than its factorization.

18406312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74256 (or 74252 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 18406312 is about 4290.2578011117. The cubic root of 18406312 is about 264.0314088740.

Adding to 18406312 its reverse (21360481), we get a palindrome (39766793).

The spelling of 18406312 in words is "eighteen million, four hundred six thousand, three hundred twelve".