18813729 has 8 divisors (see below), whose sum is σ = 27365472. Its totient is φ = 11402240.

The previous prime is 18813689. The next prime is 18813731. The reversal of 18813729 is 92731881.

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

It is a cyclic number.

It is not a de Polignac number, because 18813729 - 2⁷ = 18813601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18813229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285024 + ... + 285089.

It is an arithmetic number, because the mean of its divisors is an integer number (3420684).

Almost surely, 2^18813729 is an apocalyptic number.

It is an amenable number.

18813729 is a deficient number, since it is larger than the sum of its proper divisors (8551743).

18813729 is a wasteful number, since it uses less digits than its factorization.

18813729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570127.

The product of its digits is 24192, while the sum is 39.

The square root of 18813729 is about 4337.4795676752. The cubic root of 18813729 is about 265.9652893445.

The spelling of 18813729 in words is "eighteen million, eight hundred thirteen thousand, seven hundred twenty-nine".