238818890987 has 2 divisors, whose sum is σ = 238818890988. Its totient is φ = 238818890986.

The previous prime is 238818890873. The next prime is 238818891019. The reversal of 238818890987 is 789098818832.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 238818890987 - 2¹⁰ = 238818889963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 238818890987.

It is not a weakly prime, because it can be changed into another prime (238818890587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119409445493 + 119409445494.

It is an arithmetic number, because the mean of its divisors is an integer number (119409445494).

Almost surely, 2^238818890987 is an apocalyptic number.

238818890987 is a deficient number, since it is larger than the sum of its proper divisors (1).

238818890987 is an equidigital number, since it uses as much as digits as its factorization.

238818890987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 111476736, while the sum is 71.

The spelling of 238818890987 in words is "two hundred thirty-eight billion, eight hundred eighteen million, eight hundred ninety thousand, nine hundred eighty-seven".