18861358 has 4 divisors (see below), whose sum is σ = 28292040. Its totient is φ = 9430678.

The previous prime is 18861343. The next prime is 18861377. The reversal of 18861358 is 85316881.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 18861358.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4715338 + ... + 4715341.

It is an arithmetic number, because the mean of its divisors is an integer number (7073010).

Almost surely, 2^18861358 is an apocalyptic number.

18861358 is a deficient number, since it is larger than the sum of its proper divisors (9430682).

18861358 is an equidigital number, since it uses as much as digits as its factorization.

18861358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9430681.

The product of its digits is 46080, while the sum is 40.

The square root of 18861358 is about 4342.9664976834. The cubic root of 18861358 is about 266.1895402258.

The spelling of 18861358 in words is "eighteen million, eight hundred sixty-one thousand, three hundred fifty-eight".