18745890 has 48 divisors (see below), whose sum is σ = 46657728. Its totient is φ = 4820032.

The previous prime is 18745879. The next prime is 18745891. The reversal of 18745890 is 9854781.

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

It is not an unprimeable number, because it can be changed into a prime (18745891) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24859 + ... + 25601.

It is an arithmetic number, because the mean of its divisors is an integer number (972036).

Almost surely, 2^18745890 is an apocalyptic number.

18745890 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 18745890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23328864).

18745890 is an abundant number, since it is smaller than the sum of its proper divisors (27911838).

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

18745890 is a wasteful number, since it uses less digits than its factorization.

18745890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811 (or 782 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 18745890 is about 4329.6524109910. The cubic root of 18745890 is about 265.6452296473.

The spelling of 18745890 in words is "eighteen million, seven hundred forty-five thousand, eight hundred ninety".