18493530 has 32 divisors (see below), whose sum is σ = 48420288. Its totient is φ = 4483200.

The previous prime is 18493507. The next prime is 18493537. The reversal of 18493530 is 3539481.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 18493491 and 18493500.

It is not an unprimeable number, because it can be changed into a prime (18493537) 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, 27691 + ... + 28350.

It is an arithmetic number, because the mean of its divisors is an integer number (1513134).

Almost surely, 2^18493530 is an apocalyptic number.

18493530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18493530 is an abundant number, since it is smaller than the sum of its proper divisors (29926758).

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

18493530 is a wasteful number, since it uses less digits than its factorization.

18493530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56062.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 18493530 is about 4300.4104455273. The cubic root of 18493530 is about 264.4477880272.

The spelling of 18493530 in words is "eighteen million, four hundred ninety-three thousand, five hundred thirty".