18729841 has 8 divisors (see below), whose sum is σ = 20296640. Its totient is φ = 17181072.

The previous prime is 18729817. The next prime is 18729847. The reversal of 18729841 is 14892781.

It is a happy number.

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 18729841 - 2⁹ = 18729329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18729794 and 18729803.

It is not an unprimeable number, because it can be changed into a prime (18729847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2301 + ... + 6538.

It is an arithmetic number, because the mean of its divisors is an integer number (2537080).

Almost surely, 2^18729841 is an apocalyptic number.

It is an amenable number.

18729841 is a deficient number, since it is larger than the sum of its proper divisors (1566799).

18729841 is a wasteful number, since it uses less digits than its factorization.

18729841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9015.

The product of its digits is 32256, while the sum is 40.

The square root of 18729841 is about 4327.7986320992. The cubic root of 18729841 is about 265.5693986690.

The spelling of 18729841 in words is "eighteen million, seven hundred twenty-nine thousand, eight hundred forty-one".