18889830 has 24 divisors (see below), whose sum is σ = 49113792. Its totient is φ = 5037264.

The previous prime is 18889811. The next prime is 18889837. The reversal of 18889830 is 3898881.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18889837) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104854 + ... + 105033.

It is an arithmetic number, because the mean of its divisors is an integer number (2046408).

Almost surely, 2^18889830 is an apocalyptic number.

18889830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18889830 is an abundant number, since it is smaller than the sum of its proper divisors (30223962).

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

18889830 is a wasteful number, since it uses less digits than its factorization.

18889830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209900 (or 209897 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The square root of 18889830 is about 4346.2432053441. The cubic root of 18889830 is about 266.3234142590.

The spelling of 18889830 in words is "eighteen million, eight hundred eighty-nine thousand, eight hundred thirty".