18200730 has 32 divisors (see below), whose sum is σ = 44509824. Its totient is φ = 4761536.

The previous prime is 18200729. The next prime is 18200737. The reversal of 18200730 is 3700281.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18200697 and 18200706.

It is not an unprimeable number, because it can be changed into a prime (18200737) 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, 4134 + ... + 7313.

It is an arithmetic number, because the mean of its divisors is an integer number (1390932).

Almost surely, 2^18200730 is an apocalyptic number.

18200730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18200730 is an abundant number, since it is smaller than the sum of its proper divisors (26309094).

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

18200730 is a wasteful number, since it uses less digits than its factorization.

18200730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11510.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 18200730 is about 4266.2313580020. The cubic root of 18200730 is about 263.0447282329.

The spelling of 18200730 in words is "eighteen million, two hundred thousand, seven hundred thirty".