18872422 has 4 divisors (see below), whose sum is σ = 28308636. Its totient is φ = 9436210.

The previous prime is 18872419. The next prime is 18872429. The reversal of 18872422 is 22427881.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18872429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4718104 + ... + 4718107.

It is an arithmetic number, because the mean of its divisors is an integer number (7077159).

Almost surely, 2^18872422 is an apocalyptic number.

18872422 is a deficient number, since it is larger than the sum of its proper divisors (9436214).

18872422 is an equidigital number, since it uses as much as digits as its factorization.

18872422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9436213.

The product of its digits is 14336, while the sum is 34.

The square root of 18872422 is about 4344.2400946541. The cubic root of 18872422 is about 266.2415786385.

The spelling of 18872422 in words is "eighteen million, eight hundred seventy-two thousand, four hundred twenty-two".