18630690 has 128 divisors (see below), whose sum is σ = 52641792. Its totient is φ = 4181760.

The previous prime is 18630683. The next prime is 18630709. The reversal of 18630690 is 9603681.

It is a super-2 number, since 2×18630690² = 694205219752200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 278037 + ... + 278103.

It is an arithmetic number, because the mean of its divisors is an integer number (411264).

Almost surely, 2^18630690 is an apocalyptic number.

18630690 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 18630690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26320896).

18630690 is an abundant number, since it is smaller than the sum of its proper divisors (34011102).

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

18630690 is a wasteful number, since it uses less digits than its factorization.

18630690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 18630690 is about 4316.3283007668. The cubic root of 18630690 is about 265.0999504302.

It can be divided in two parts, 186 and 30690, that added together give a triangular number (30876 = T₂₄₈).

The spelling of 18630690 in words is "eighteen million, six hundred thirty thousand, six hundred ninety".