18321830 has 8 divisors (see below), whose sum is σ = 32979312. Its totient is φ = 7328728.

The previous prime is 18321829. The next prime is 18321839. The reversal of 18321830 is 3812381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 18321830.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18321839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 916082 + ... + 916101.

It is an arithmetic number, because the mean of its divisors is an integer number (4122414).

Almost surely, 2^18321830 is an apocalyptic number.

18321830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18321830 is a deficient number, since it is larger than the sum of its proper divisors (14657482).

18321830 is a wasteful number, since it uses less digits than its factorization.

18321830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1832190.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 18321830 is about 4280.4006821792. The cubic root of 18321830 is about 263.6268354211.

The spelling of 18321830 in words is "eighteen million, three hundred twenty-one thousand, eight hundred thirty".