18301212 has 18 divisors (see below), whose sum is σ = 46261488. Its totient is φ = 6100392.

The previous prime is 18301207. The next prime is 18301229. The reversal of 18301212 is 21210381.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 254148 + ... + 254219.

Almost surely, 2^18301212 is an apocalyptic number.

18301212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18301212 is an abundant number, since it is smaller than the sum of its proper divisors (27960276).

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

18301212 is a wasteful number, since it uses less digits than its factorization.

18301212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508377 (or 508372 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 18301212 is about 4277.9915848445. The cubic root of 18301212 is about 263.5279097452.

Adding to 18301212 its reverse (21210381), we get a palindrome (39511593).

The spelling of 18301212 in words is "eighteen million, three hundred one thousand, two hundred twelve".