18848721 has 8 divisors (see below), whose sum is σ = 25380864. Its totient is φ = 12441200.

The previous prime is 18848717. The next prime is 18848723. The reversal of 18848721 is 12784881.

It is a happy number.

18848721 is nontrivially palindromic in base 4.

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 18848721 - 2² = 18848717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18848721.

It is not an unprimeable number, because it can be changed into a prime (18848723) 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, 30801 + ... + 31406.

It is an arithmetic number, because the mean of its divisors is an integer number (3172608).

Almost surely, 2^18848721 is an apocalyptic number.

It is an amenable number.

18848721 is a deficient number, since it is larger than the sum of its proper divisors (6532143).

18848721 is a wasteful number, since it uses less digits than its factorization.

18848721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62311.

The product of its digits is 28672, while the sum is 39.

The square root of 18848721 is about 4341.5113727825. The cubic root of 18848721 is about 266.1300784636.

The spelling of 18848721 in words is "eighteen million, eight hundred forty-eight thousand, seven hundred twenty-one".