238090987 has 2 divisors, whose sum is σ = 238090988. Its totient is φ = 238090986.

The previous prime is 238090981. The next prime is 238090997. The reversal of 238090987 is 789090832.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 238090987 - 2²³ = 229702379 is a prime.

It is not a weakly prime, because it can be changed into another prime (238090981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119045493 + 119045494.

It is an arithmetic number, because the mean of its divisors is an integer number (119045494).

Almost surely, 2^238090987 is an apocalyptic number.

238090987 is a deficient number, since it is larger than the sum of its proper divisors (1).

238090987 is an equidigital number, since it uses as much as digits as its factorization.

238090987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 238090987 is about 15430.1972443647. The cubic root of 238090987 is about 619.7944054701.

The spelling of 238090987 in words is "two hundred thirty-eight million, ninety thousand, nine hundred eighty-seven".