18893939 has 8 divisors (see below), whose sum is σ = 19580640. Its totient is φ = 18216576.

The previous prime is 18893887. The next prime is 18893947. The reversal of 18893939 is 93939881.

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 18893939 - 2⁸ = 18893683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18893639) 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, 1922 + ... + 6440.

It is an arithmetic number, because the mean of its divisors is an integer number (2447580).

Almost surely, 2^18893939 is an apocalyptic number.

18893939 is a deficient number, since it is larger than the sum of its proper divisors (686701).

18893939 is a wasteful number, since it uses less digits than its factorization.

18893939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4669.

The product of its digits is 419904, while the sum is 50.

The square root of 18893939 is about 4346.7158867356. The cubic root of 18893939 is about 266.3427234777.

The spelling of 18893939 in words is "eighteen million, eight hundred ninety-three thousand, nine hundred thirty-nine".