18910012 has 12 divisors (see below), whose sum is σ = 36101016. Its totient is φ = 8595440.

The previous prime is 18910009. The next prime is 18910039. The reversal of 18910012 is 21001981.

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 214843 + ... + 214930.

It is an arithmetic number, because the mean of its divisors is an integer number (3008418).

Almost surely, 2^18910012 is an apocalyptic number.

It is an amenable number.

18910012 is a deficient number, since it is larger than the sum of its proper divisors (17191004).

18910012 is a wasteful number, since it uses less digits than its factorization.

18910012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429788 (or 429786 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 18910012 is about 4348.5643607977. The cubic root of 18910012 is about 266.4182276423.

Adding to 18910012 its reverse (21001981), we get a palindrome (39911993).

It can be divided in two parts, 189 and 10012, that added together give a palindrome (10201).

The spelling of 18910012 in words is "eighteen million, nine hundred ten thousand, twelve".