18513830 has 16 divisors (see below), whose sum is σ = 33437664. Its totient is φ = 7380480.

The previous prime is 18513767. The next prime is 18513841. The reversal of 18513830 is 3831581.

It is a junction number, because it is equal to n+sod(n) for n = 18513793 and 18513802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134 + ... + 6086.

It is an arithmetic number, because the mean of its divisors is an integer number (2089854).

Almost surely, 2^18513830 is an apocalyptic number.

18513830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18513830 is a deficient number, since it is larger than the sum of its proper divisors (14923834).

18513830 is a wasteful number, since it uses less digits than its factorization.

18513830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6271.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 18513830 is about 4302.7700380104. The cubic root of 18513830 is about 264.5445124324.

The spelling of 18513830 in words is "eighteen million, five hundred thirteen thousand, eight hundred thirty".