18991622 has 8 divisors (see below), whose sum is σ = 30678816. Its totient is φ = 8765352.

The previous prime is 18991589. The next prime is 18991627. The reversal of 18991622 is 22619981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18991627) 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, 365198 + ... + 365249.

It is an arithmetic number, because the mean of its divisors is an integer number (3834852).

Almost surely, 2^18991622 is an apocalyptic number.

18991622 is a deficient number, since it is larger than the sum of its proper divisors (11687194).

18991622 is a wasteful number, since it uses less digits than its factorization.

18991622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730462.

The product of its digits is 15552, while the sum is 38.

The square root of 18991622 is about 4357.9378150680. The cubic root of 18991622 is about 266.8009382832.

The spelling of 18991622 in words is "eighteen million, nine hundred ninety-one thousand, six hundred twenty-two".