18989722 has 8 divisors (see below), whose sum is σ = 29466900. Its totient is φ = 9167424.

The previous prime is 18989713. The next prime is 18989767. The reversal of 18989722 is 22798981.

It can be written as a sum of positive squares in 2 ways, for example, as 16394401 + 2595321 = 4049^2 + 1611^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163647 + ... + 163762.

Almost surely, 2^18989722 is an apocalyptic number.

18989722 is a deficient number, since it is larger than the sum of its proper divisors (10477178).

18989722 is a wasteful number, since it uses less digits than its factorization.

18989722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327440.

The product of its digits is 145152, while the sum is 46.

The square root of 18989722 is about 4357.7198166013. The cubic root of 18989722 is about 266.7920406986.

The spelling of 18989722 in words is "eighteen million, nine hundred eighty-nine thousand, seven hundred twenty-two".