18090030 has 32 divisors (see below), whose sum is σ = 49618944. Its totient is φ = 4134816.

The previous prime is 18090001. The next prime is 18090031. The reversal of 18090030 is 3009081.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 18089979 and 18090006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18090031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42862 + ... + 43281.

It is an arithmetic number, because the mean of its divisors is an integer number (1550592).

Almost surely, 2^18090030 is an apocalyptic number.

18090030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18090030 is an abundant number, since it is smaller than the sum of its proper divisors (31528914).

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

18090030 is a wasteful number, since it uses less digits than its factorization.

18090030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86160.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 18090030 is about 4253.2375903540. The cubic root of 18090030 is about 262.5103487984.

The spelling of 18090030 in words is "eighteen million, ninety thousand, thirty".