18893913 has 4 divisors (see below), whose sum is σ = 25191888. Its totient is φ = 12595940.

The previous prime is 18893887. The next prime is 18893947. The reversal of 18893913 is 31939881.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31939881 = 3 ⋅10646627.

It is a cyclic number.

It is not a de Polignac number, because 18893913 - 2¹⁰ = 18892889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18893113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3148983 + ... + 3148988.

It is an arithmetic number, because the mean of its divisors is an integer number (6297972).

Almost surely, 2^18893913 is an apocalyptic number.

It is an amenable number.

18893913 is a deficient number, since it is larger than the sum of its proper divisors (6297975).

18893913 is an equidigital number, since it uses as much as digits as its factorization.

18893913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6297974.

The product of its digits is 46656, while the sum is 42.

The square root of 18893913 is about 4346.7128959709. The cubic root of 18893913 is about 266.3426013060.

The spelling of 18893913 in words is "eighteen million, eight hundred ninety-three thousand, nine hundred thirteen".