18666722 has 8 divisors (see below), whose sum is σ = 28756956. Its totient is φ = 9081072.

The previous prime is 18666709. The next prime is 18666733. The reversal of 18666722 is 22766681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17799961 + 866761 = 4219^2 + 931^2 .

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, 126053 + ... + 126200.

Almost surely, 2^18666722 is an apocalyptic number.

18666722 is a deficient number, since it is larger than the sum of its proper divisors (10090234).

18666722 is a wasteful number, since it uses less digits than its factorization.

18666722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252292.

The product of its digits is 48384, while the sum is 38.

The square root of 18666722 is about 4320.5002025229. The cubic root of 18666722 is about 265.2707426387.

The spelling of 18666722 in words is "eighteen million, six hundred sixty-six thousand, seven hundred twenty-two".