18213030 has 48 divisors (see below), whose sum is σ = 51661584. Its totient is φ = 4415040.

The previous prime is 18213029. The next prime is 18213043. The reversal of 18213030 is 3031281.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 18212994 and 18213012.

It is a congruent number.

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, 8209 + ... + 10188.

It is an arithmetic number, because the mean of its divisors is an integer number (1076283).

Almost surely, 2^18213030 is an apocalyptic number.

18213030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18213030 is an abundant number, since it is smaller than the sum of its proper divisors (33448554).

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

18213030 is a wasteful number, since it uses less digits than its factorization.

18213030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18421 (or 18418 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 18213030 is about 4267.6726678601. The cubic root of 18213030 is about 263.1039698420.

It can be divided in two parts, 1821 and 3030, that added together give a triangular number (4851 = T₉₈).

The spelling of 18213030 in words is "eighteen million, two hundred thirteen thousand, thirty".