18898642 has 8 divisors (see below), whose sum is σ = 32397696. Its totient is φ = 8099412.

The previous prime is 18898639. The next prime is 18898643. The reversal of 18898642 is 24689881.

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

It is a junction number, because it is equal to n+sod(n) for n = 18898592 and 18898601.

It is not an unprimeable number, because it can be changed into a prime (18898643) 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 3 ways as a sum of consecutive naturals, for example, 674938 + ... + 674965.

It is an arithmetic number, because the mean of its divisors is an integer number (4049712).

Almost surely, 2^18898642 is an apocalyptic number.

18898642 is a deficient number, since it is larger than the sum of its proper divisors (13499054).

18898642 is a wasteful number, since it uses less digits than its factorization.

18898642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349912.

The product of its digits is 221184, while the sum is 46.

The square root of 18898642 is about 4347.2568362129. The cubic root of 18898642 is about 266.3648206153.

The spelling of 18898642 in words is "eighteen million, eight hundred ninety-eight thousand, six hundred forty-two".