18897996 has 72 divisors (see below), whose sum is σ = 49858480. Its totient is φ = 5537664.

The previous prime is 18897971. The next prime is 18898037. The reversal of 18897996 is 69979881.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82410 + ... + 82638.

Almost surely, 2^18897996 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 18897996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24929240).

18897996 is an abundant number, since it is smaller than the sum of its proper divisors (30960484).

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

18897996 is a wasteful number, since it uses less digits than its factorization.

18897996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295 (or 270 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 57.

The square root of 18897996 is about 4347.1825358501. The cubic root of 18897996 is about 266.3617855889.

The spelling of 18897996 in words is "eighteen million, eight hundred ninety-seven thousand, nine hundred ninety-six".