18809494 has 16 divisors (see below), whose sum is σ = 31435776. Its totient is φ = 8367400.

The previous prime is 18809473. The next prime is 18809509. The reversal of 18809494 is 49490881.

18809494 is a modest number, since divided by 9494 gives 1880 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 18809494.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 8062 + ... + 10129.

It is an arithmetic number, because the mean of its divisors is an integer number (1964736).

Almost surely, 2^18809494 is an apocalyptic number.

18809494 is a deficient number, since it is larger than the sum of its proper divisors (12626282).

18809494 is a wasteful number, since it uses less digits than its factorization.

18809494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18251.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 18809494 is about 4336.9913534615. The cubic root of 18809494 is about 265.9453314452.

The spelling of 18809494 in words is "eighteen million, eight hundred nine thousand, four hundred ninety-four".