18839649 has 8 divisors (see below), whose sum is σ = 25213312. Its totient is φ = 12512880.

The previous prime is 18839603. The next prime is 18839677. The reversal of 18839649 is 94693881.

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

It is not a de Polignac number, because 18839649 - 2⁹ = 18839137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18839598 and 18839607.

It is not an unprimeable number, because it can be changed into a prime (18839749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10774 + ... + 12399.

It is an arithmetic number, because the mean of its divisors is an integer number (3151664).

Almost surely, 2^18839649 is an apocalyptic number.

It is an amenable number.

18839649 is a deficient number, since it is larger than the sum of its proper divisors (6373663).

18839649 is a wasteful number, since it uses less digits than its factorization.

18839649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23447.

The product of its digits is 373248, while the sum is 48.

The square root of 18839649 is about 4340.4664495881. The cubic root of 18839649 is about 266.0873749557.

The spelling of 18839649 in words is "eighteen million, eight hundred thirty-nine thousand, six hundred forty-nine".