238218989 has 2 divisors, whose sum is σ = 238218990. Its totient is φ = 238218988.

The previous prime is 238218947. The next prime is 238218991. The reversal of 238218989 is 989812832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205922500 + 32296489 = 14350^2 + 5683^2 .

It is a cyclic number.

It is not a de Polignac number, because 238218989 - 2¹⁶ = 238153453 is a prime.

Together with 238218991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238218919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119109494 + 119109495.

It is an arithmetic number, because the mean of its divisors is an integer number (119109495).

Almost surely, 2^238218989 is an apocalyptic number.

It is an amenable number.

238218989 is a deficient number, since it is larger than the sum of its proper divisors (1).

238218989 is an equidigital number, since it uses as much as digits as its factorization.

238218989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 50.

The square root of 238218989 is about 15434.3444629178. The cubic root of 238218989 is about 619.9054564475.

The spelling of 238218989 in words is "two hundred thirty-eight million, two hundred eighteen thousand, nine hundred eighty-nine".