18905730 has 32 divisors (see below), whose sum is σ = 46122048. Its totient is φ = 4958400.

The previous prime is 18905729. The next prime is 18905737. The reversal of 18905730 is 3750981.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18905691 and 18905700.

It is not an unprimeable number, because it can be changed into a prime (18905737) 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, 3336 + ... + 6995.

It is an arithmetic number, because the mean of its divisors is an integer number (1441314).

Almost surely, 2^18905730 is an apocalyptic number.

18905730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18905730 is an abundant number, since it is smaller than the sum of its proper divisors (27216318).

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

18905730 is a wasteful number, since it uses less digits than its factorization.

18905730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10402.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 18905730 is about 4348.0719865246. The cubic root of 18905730 is about 266.3981167972.

The spelling of 18905730 in words is "eighteen million, nine hundred five thousand, seven hundred thirty".