18625890 has 64 divisors (see below), whose sum is σ = 48263040. Its totient is φ = 4584960.

The previous prime is 18625889. The next prime is 18625907. The reversal of 18625890 is 9852681.

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 31 ways as a sum of consecutive naturals, for example, 22972 + ... + 23768.

It is an arithmetic number, because the mean of its divisors is an integer number (754110).

Almost surely, 2^18625890 is an apocalyptic number.

18625890 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 18625890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24131520).

18625890 is an abundant number, since it is smaller than the sum of its proper divisors (29637150).

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

18625890 is a wasteful number, since it uses less digits than its factorization.

18625890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 18625890 is about 4315.7722368077. The cubic root of 18625890 is about 265.0771817430.

The spelling of 18625890 in words is "eighteen million, six hundred twenty-five thousand, eight hundred ninety".