18305530 has 16 divisors (see below), whose sum is σ = 33717024. Its totient is φ = 7151760.

The previous prime is 18305527. The next prime is 18305533. The reversal of 18305530 is 3550381.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18305527) and next prime (18305533).

It is a junction number, because it is equal to n+sod(n) for n = 18305495 and 18305504.

It is not an unprimeable number, because it can be changed into a prime (18305533) 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, 20856 + ... + 21715.

It is an arithmetic number, because the mean of its divisors is an integer number (2107314).

Almost surely, 2^18305530 is an apocalyptic number.

18305530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18305530 is a deficient number, since it is larger than the sum of its proper divisors (15411494).

18305530 is a wasteful number, since it uses less digits than its factorization.

18305530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42621.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 18305530 is about 4278.4962311541. The cubic root of 18305530 is about 263.5486337649.

The spelling of 18305530 in words is "eighteen million, three hundred five thousand, five hundred thirty".