18996280 has 16 divisors (see below), whose sum is σ = 42741720. Its totient is φ = 7598496.

The previous prime is 18996277. The next prime is 18996311. The reversal of 18996280 is 8269981.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237414 + ... + 237493.

Almost surely, 2^18996280 is an apocalyptic number.

18996280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18996280 is an abundant number, since it is smaller than the sum of its proper divisors (23745440).

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

18996280 is a wasteful number, since it uses less digits than its factorization.

18996280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474918 (or 474914 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 18996280 is about 4358.4722093871. The cubic root of 18996280 is about 266.8227489037.

It can be divided in two parts, 189 and 96280, that added together give a palindrome (96469).

The spelling of 18996280 in words is "eighteen million, nine hundred ninety-six thousand, two hundred eighty".