18729722 has 8 divisors (see below), whose sum is σ = 30648672. Its totient is φ = 8513500.

The previous prime is 18729721. The next prime is 18729731. The reversal of 18729722 is 22792781.

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

It is not an unprimeable number, because it can be changed into a prime (18729721) 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, 425654 + ... + 425697.

It is an arithmetic number, because the mean of its divisors is an integer number (3831084).

Almost surely, 2^18729722 is an apocalyptic number.

18729722 is a deficient number, since it is larger than the sum of its proper divisors (11918950).

18729722 is a wasteful number, since it uses less digits than its factorization.

18729722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851364.

The product of its digits is 28224, while the sum is 38.

The square root of 18729722 is about 4327.7848837483. The cubic root of 18729722 is about 265.5688362363.

The spelling of 18729722 in words is "eighteen million, seven hundred twenty-nine thousand, seven hundred twenty-two".