18990212 has 24 divisors (see below), whose sum is σ = 34329120. Its totient is φ = 9187200.

The previous prime is 18990187. The next prime is 18990217. The reversal of 18990212 is 21209981.

It is a happy number.

18990212 is nontrivially palindromic in base 7.

It is not an unprimeable number, because it can be changed into a prime (18990217) 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, 15212 + ... + 16412.

It is an arithmetic number, because the mean of its divisors is an integer number (1430380).

Almost surely, 2^18990212 is an apocalyptic number.

It is an amenable number.

18990212 is a deficient number, since it is larger than the sum of its proper divisors (15338908).

18990212 is a wasteful number, since it uses less digits than its factorization.

18990212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331 (or 1329 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 18990212 is about 4357.7760383021. The cubic root of 18990212 is about 266.7943353956.

The spelling of 18990212 in words is "eighteen million, nine hundred ninety thousand, two hundred twelve".