238998391 has 2 divisors, whose sum is σ = 238998392. Its totient is φ = 238998390.

The previous prime is 238998371. The next prime is 238998413. The reversal of 238998391 is 193899832.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238998391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238998301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119499195 + 119499196.

It is an arithmetic number, because the mean of its divisors is an integer number (119499196).

Almost surely, 2^238998391 is an apocalyptic number.

238998391 is a deficient number, since it is larger than the sum of its proper divisors (1).

238998391 is an equidigital number, since it uses as much as digits as its factorization.

238998391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 52.

The square root of 238998391 is about 15459.5727948737. The cubic root of 238998391 is about 620.5807868550.

The spelling of 238998391 in words is "two hundred thirty-eight million, nine hundred ninety-eight thousand, three hundred ninety-one".