18809438 has 16 divisors (see below), whose sum is σ = 28712880. Its totient is φ = 9240000.

The previous prime is 18809419. The next prime is 18809443. The reversal of 18809438 is 83490881.

It is a junction number, because it is equal to n+sod(n) for n = 18809395 and 18809404.

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, 44468 + ... + 44888.

It is an arithmetic number, because the mean of its divisors is an integer number (1794555).

Almost surely, 2^18809438 is an apocalyptic number.

18809438 is a deficient number, since it is larger than the sum of its proper divisors (9903442).

18809438 is a wasteful number, since it uses less digits than its factorization.

18809438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 18809438 is about 4336.9848973682. The cubic root of 18809438 is about 265.9450675191.

The spelling of 18809438 in words is "eighteen million, eight hundred nine thousand, four hundred thirty-eight".