18201830 has 16 divisors (see below), whose sum is σ = 32936544. Its totient is φ = 7242240.

The previous prime is 18201797. The next prime is 18201839. The reversal of 18201830 is 3810281.

It is a junction number, because it is equal to n+sod(n) for n = 18201796 and 18201805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18201839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2786 + ... + 6645.

It is an arithmetic number, because the mean of its divisors is an integer number (2058534).

Almost surely, 2^18201830 is an apocalyptic number.

18201830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18201830 is a deficient number, since it is larger than the sum of its proper divisors (14734714).

18201830 is a wasteful number, since it uses less digits than its factorization.

18201830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9631.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 18201830 is about 4266.3602754573. The cubic root of 18201830 is about 263.0500273495.

The spelling of 18201830 in words is "eighteen million, two hundred one thousand, eight hundred thirty".