18945836 has 96 divisors (see below), whose sum is σ = 44556288. Its totient is φ = 6842880.

The previous prime is 18945821. The next prime is 18945877. The reversal of 18945836 is 63854981.

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 31 ways as a sum of consecutive naturals, for example, 259496 + ... + 259568.

It is an arithmetic number, because the mean of its divisors is an integer number (464128).

Almost surely, 2^18945836 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 18945836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22278144).

18945836 is an abundant number, since it is smaller than the sum of its proper divisors (25610452).

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

18945836 is a wasteful number, since it uses less digits than its factorization.

18945836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 149 counting only the distinct ones).

The product of its digits is 207360, while the sum is 44.

The square root of 18945836 is about 4352.6814723800. The cubic root of 18945836 is about 266.5863598458.

The spelling of 18945836 in words is "eighteen million, nine hundred forty-five thousand, eight hundred thirty-six".