18942812 has 36 divisors (see below), whose sum is σ = 38916864. Its totient is φ = 8043840.

The previous prime is 18942809. The next prime is 18942851. The reversal of 18942812 is 21824981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24512 + ... + 25272.

It is an arithmetic number, because the mean of its divisors is an integer number (1081024).

Almost surely, 2^18942812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18942812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19458432).

18942812 is an abundant number, since it is smaller than the sum of its proper divisors (19974052).

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

18942812 is a wasteful number, since it uses less digits than its factorization.

18942812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906 (or 897 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 18942812 is about 4352.3340864414. The cubic root of 18942812 is about 266.5721755496.

The spelling of 18942812 in words is "eighteen million, nine hundred forty-two thousand, eight hundred twelve".