18822887 has 4 divisors (see below), whose sum is σ = 18942936. Its totient is φ = 18702840.

The previous prime is 18822871. The next prime is 18822907. The reversal of 18822887 is 78822881.

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

It is a cyclic number.

It is not a de Polignac number, because 18822887 - 2⁴ = 18822871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18822857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59789 + ... + 60102.

It is an arithmetic number, because the mean of its divisors is an integer number (4735734).

Almost surely, 2^18822887 is an apocalyptic number.

18822887 is a deficient number, since it is larger than the sum of its proper divisors (120049).

18822887 is a wasteful number, since it uses less digits than its factorization.

18822887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120048.

The product of its digits is 114688, while the sum is 44.

The square root of 18822887 is about 4338.5351214436. The cubic root of 18822887 is about 266.0084371794.

The spelling of 18822887 in words is "eighteen million, eight hundred twenty-two thousand, eight hundred eighty-seven".