18961212 has 24 divisors (see below), whose sum is σ = 45670912. Its totient is φ = 6116400.

The previous prime is 18961199. The next prime is 18961219. The reversal of 18961212 is 21216981.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18961212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18961219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25114 + ... + 25857.

Almost surely, 2^18961212 is an apocalyptic number.

18961212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18961212 is an abundant number, since it is smaller than the sum of its proper divisors (26709700).

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

18961212 is a wasteful number, since it uses less digits than its factorization.

18961212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51009 (or 51007 counting only the distinct ones).

The product of its digits is 1728, while the sum is 30.

The square root of 18961212 is about 4354.4473817007. The cubic root of 18961212 is about 266.6584587751.

The spelling of 18961212 in words is "eighteen million, nine hundred sixty-one thousand, two hundred twelve".