18949880 has 32 divisors (see below), whose sum is σ = 43124400. Its totient is φ = 7493376.

The previous prime is 18949877. The next prime is 18949949. The reversal of 18949880 is 8894981.

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 7 ways as a sum of consecutive naturals, for example, 899 + ... + 6221.

Almost surely, 2^18949880 is an apocalyptic number.

18949880 is a gapful number since it is divisible by the number (10) 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 18949880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21562200).

18949880 is an abundant number, since it is smaller than the sum of its proper divisors (24174520).

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

18949880 is a wasteful number, since it uses less digits than its factorization.

18949880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5423 (or 5419 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 47.

The square root of 18949880 is about 4353.1459888223. The cubic root of 18949880 is about 266.6053261689.

The spelling of 18949880 in words is "eighteen million, nine hundred forty-nine thousand, eight hundred eighty".