18875393 has 2 divisors, whose sum is σ = 18875394. Its totient is φ = 18875392.

The previous prime is 18875377. The next prime is 18875399. The reversal of 18875393 is 39357881.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14807104 + 4068289 = 3848^2 + 2017^2 .

It is an emirp because it is prime and its reverse (39357881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18875393 - 2⁴ = 18875377 is a prime.

It is not a weakly prime, because it can be changed into another prime (18875399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9437696 + 9437697.

It is an arithmetic number, because the mean of its divisors is an integer number (9437697).

Almost surely, 2^18875393 is an apocalyptic number.

It is an amenable number.

18875393 is a deficient number, since it is larger than the sum of its proper divisors (1).

18875393 is an equidigital number, since it uses as much as digits as its factorization.

18875393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The square root of 18875393 is about 4344.5820282278. The cubic root of 18875393 is about 266.2555489744.

The spelling of 18875393 in words is "eighteen million, eight hundred seventy-five thousand, three hundred ninety-three".