18880290 has 160 divisors (see below), whose sum is σ = 60008256. Its totient is φ = 4199040.

The previous prime is 18880241. The next prime is 18880297. The reversal of 18880290 is 9208881.

It is not an unprimeable number, because it can be changed into a prime (18880297) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 115749 + ... + 115911.

Almost surely, 2^18880290 is an apocalyptic number.

18880290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18880290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30004128).

18880290 is an abundant number, since it is smaller than the sum of its proper divisors (41127966).

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

18880290 is a wasteful number, since it uses less digits than its factorization.

18880290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 18880290 is about 4345.1455671818. The cubic root of 18880290 is about 266.2785726130.

The spelling of 18880290 in words is "eighteen million, eight hundred eighty thousand, two hundred ninety".