18809434 has 20 divisors (see below), whose sum is σ = 32922954. Its totient is φ = 8059128.

The previous prime is 18809419. The next prime is 18809443. The reversal of 18809434 is 43490881.

It can be written as a sum of positive squares in only one way, i.e., 13505625 + 5303809 = 3675^2 + 2303^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18809393 and 18809402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2844 + ... + 6760.

Almost surely, 2^18809434 is an apocalyptic number.

18809434 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18809434 is a deficient number, since it is larger than the sum of its proper divisors (14113520).

18809434 is an frugal number, since it uses more digits than its factorization.

18809434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3947 (or 3926 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 18809434 is about 4336.9844362183. The cubic root of 18809434 is about 265.9450486672.

The spelling of 18809434 in words is "eighteen million, eight hundred nine thousand, four hundred thirty-four".