18640830 has 32 divisors (see below), whose sum is σ = 48180384. Its totient is φ = 4588416.

The previous prime is 18640813. The next prime is 18640841. The reversal of 18640830 is 3804681.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23509 + ... + 24288.

It is an arithmetic number, because the mean of its divisors is an integer number (1505637).

Almost surely, 2^18640830 is an apocalyptic number.

18640830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18640830 is an abundant number, since it is smaller than the sum of its proper divisors (29539554).

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

18640830 is a wasteful number, since it uses less digits than its factorization.

18640830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47820.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18640830 is about 4317.5027504334. The cubic root of 18640830 is about 265.1480364282.

The spelling of 18640830 in words is "eighteen million, six hundred forty thousand, eight hundred thirty".