18878383 has 2 divisors, whose sum is σ = 18878384. Its totient is φ = 18878382.

The previous prime is 18878357. The next prime is 18878429. The reversal of 18878383 is 38387881.

It is an a-pointer prime, because the next prime (18878429) can be obtained adding 18878383 to its sum of digits (46).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18878383 - 2¹³ = 18870191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18878303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9439191 + 9439192.

It is an arithmetic number, because the mean of its divisors is an integer number (9439192).

Almost surely, 2^18878383 is an apocalyptic number.

18878383 is a deficient number, since it is larger than the sum of its proper divisors (1).

18878383 is an equidigital number, since it uses as much as digits as its factorization.

18878383 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 46.

The square root of 18878383 is about 4344.9261213512. The cubic root of 18878383 is about 266.2696071728.

The spelling of 18878383 in words is "eighteen million, eight hundred seventy-eight thousand, three hundred eighty-three".