18989010 has 48 divisors (see below), whose sum is σ = 49884120. Its totient is φ = 5011200.

The previous prime is 18988967. The next prime is 18989023. The reversal of 18989010 is 1098981.

It can be written as a sum of positive squares in 4 ways, for example, as 18948609 + 40401 = 4353^2 + 201^2 .

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8046 + ... + 10134.

Almost surely, 2^18989010 is an apocalyptic number.

18989010 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 18989010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24942060).

18989010 is an abundant number, since it is smaller than the sum of its proper divisors (30895110).

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

18989010 is a wasteful number, since it uses less digits than its factorization.

18989010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2203 (or 2200 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 18989010 is about 4357.6381217352. The cubic root of 18989010 is about 266.7887062930.

The spelling of 18989010 in words is "eighteen million, nine hundred eighty-nine thousand, ten".