18900630 has 96 divisors (see below), whose sum is σ = 59155200. Its totient is φ = 4090176.

The previous prime is 18900619. The next prime is 18900647. The reversal of 18900630 is 3600981.

18900630 = T₁₄₀₁ + T₁₄₀₂ + ... + T₁₄₁₉.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18900594 and 18900603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11181 + ... + 12759.

It is an arithmetic number, because the mean of its divisors is an integer number (616200).

Almost surely, 2^18900630 is an apocalyptic number.

18900630 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 18900630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29577600).

18900630 is an abundant number, since it is smaller than the sum of its proper divisors (40254570).

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

18900630 is a wasteful number, since it uses less digits than its factorization.

18900630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1618 (or 1615 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 18900630 is about 4347.4854801368. The cubic root of 18900630 is about 266.3741601699.

The spelling of 18900630 in words is "eighteen million, nine hundred thousand, six hundred thirty".