18862993 has 4 divisors (see below), whose sum is σ = 19323108. Its totient is φ = 18402880.

The previous prime is 18862951. The next prime is 18863023. The reversal of 18862993 is 39926881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39926881 = 29 ⋅1376789.

It can be written as a sum of positive squares in 2 ways, for example, as 6310144 + 12552849 = 2512^2 + 3543^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18862993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18862903) 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, 229996 + ... + 230077.

It is an arithmetic number, because the mean of its divisors is an integer number (4830777).

Almost surely, 2^18862993 is an apocalyptic number.

It is an amenable number.

18862993 is a deficient number, since it is larger than the sum of its proper divisors (460115).

18862993 is an equidigital number, since it uses as much as digits as its factorization.

18862993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460114.

The product of its digits is 186624, while the sum is 46.

The square root of 18862993 is about 4343.1547289960. The cubic root of 18862993 is about 266.1972315653.

The spelling of 18862993 in words is "eighteen million, eight hundred sixty-two thousand, nine hundred ninety-three".