18390012 has 24 divisors (see below), whose sum is σ = 43080576. Its totient is φ = 6105648.

The previous prime is 18389989. The next prime is 18390013. The reversal of 18390012 is 21009381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18390013) 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, 243 + ... + 6069.

It is an arithmetic number, because the mean of its divisors is an integer number (1795024).

Almost surely, 2^18390012 is an apocalyptic number.

18390012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18390012 is an abundant number, since it is smaller than the sum of its proper divisors (24690564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18390012 is a wasteful number, since it uses less digits than its factorization.

18390012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6097 (or 6095 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 18390012 is about 4288.3577276155. The cubic root of 18390012 is about 263.9534467960.

Adding to 18390012 its reverse (21009381), we get a palindrome (39399393).

The spelling of 18390012 in words is "eighteen million, three hundred ninety thousand, twelve".