18921036 has 48 divisors (see below), whose sum is σ = 47989760. Its totient is φ = 5780160.

The previous prime is 18921031. The next prime is 18921043. The reversal of 18921036 is 63012981.

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

It is a junction number, because it is equal to n+sod(n) for n = 18920994 and 18921012.

It is not an unprimeable number, because it can be changed into a prime (18921031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5730 + ... + 8406.

Almost surely, 2^18921036 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 18921036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23994880).

18921036 is an abundant number, since it is smaller than the sum of its proper divisors (29068724).

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

18921036 is a wasteful number, since it uses less digits than its factorization.

18921036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2734 (or 2732 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 18921036 is about 4349.8317208830. The cubic root of 18921036 is about 266.4699890056.

The spelling of 18921036 in words is "eighteen million, nine hundred twenty-one thousand, thirty-six".