218989399 has 2 divisors, whose sum is σ = 218989400. Its totient is φ = 218989398.

The previous prime is 218989391. The next prime is 218989447. The reversal of 218989399 is 993989812.

218989399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218989399 - 2³ = 218989391 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218989391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109494699 + 109494700.

It is an arithmetic number, because the mean of its divisors is an integer number (109494700).

Almost surely, 2^218989399 is an apocalyptic number.

218989399 is a deficient number, since it is larger than the sum of its proper divisors (1).

218989399 is an equidigital number, since it uses as much as digits as its factorization.

218989399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 58.

The square root of 218989399 is about 14798.2904080167. The cubic root of 218989399 is about 602.7552899647.

The spelling of 218989399 in words is "two hundred eighteen million, nine hundred eighty-nine thousand, three hundred ninety-nine".