18799830 has 160 divisors (see below), whose sum is σ = 60501600. Its totient is φ = 4148928.

The previous prime is 18799829. The next prime is 18799871. The reversal of 18799830 is 3899781.

18799830 = T₄₃₅ + T₄₃₆ + ... + T₅₇₉.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 648256 + ... + 648284.

It is an arithmetic number, because the mean of its divisors is an integer number (378135).

Almost surely, 2^18799830 is an apocalyptic number.

18799830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18799830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30250800).

18799830 is an abundant number, since it is smaller than the sum of its proper divisors (41701770).

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

18799830 is an equidigital number, since it uses as much as digits as its factorization.

18799830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73 (or 46 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 18799830 is about 4335.8770739033. The cubic root of 18799830 is about 265.8997775711.

The spelling of 18799830 in words is "eighteen million, seven hundred ninety-nine thousand, eight hundred thirty".