18987822 has 24 divisors (see below), whose sum is σ = 47017776. Its totient is φ = 5425056.

The previous prime is 18987803. The next prime is 18987853. The reversal of 18987822 is 22878981.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75223 + ... + 75474.

It is an arithmetic number, because the mean of its divisors is an integer number (1959074).

Almost surely, 2^18987822 is an apocalyptic number.

18987822 is an abundant number, since it is smaller than the sum of its proper divisors (28029954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18987822 is a wasteful number, since it uses less digits than its factorization.

18987822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150712 (or 150709 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 18987822 is about 4357.5018072285. The cubic root of 18987822 is about 266.7831425205.

The spelling of 18987822 in words is "eighteen million, nine hundred eighty-seven thousand, eight hundred twenty-two".