18990336 has 72 divisors (see below), whose sum is σ = 51345280. Its totient is φ = 6230016.

The previous prime is 18990313. The next prime is 18990353. The reversal of 18990336 is 63309981.

It is a super-2 number, since 2×18990336² = 721265722785792, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18990294 and 18990303.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60516 + ... + 60828.

Almost surely, 2^18990336 is an apocalyptic number.

18990336 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18990336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25672640).

18990336 is an abundant number, since it is smaller than the sum of its proper divisors (32354944).

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

18990336 is an equidigital number, since it uses as much as digits as its factorization.

18990336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411 (or 397 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 18990336 is about 4357.7902657195. The cubic root of 18990336 is about 266.7949160882.

It can be divided in two parts, 189 and 90336, that added together give a triangular number (90525 = T₄₂₅).

The spelling of 18990336 in words is "eighteen million, nine hundred ninety thousand, three hundred thirty-six".