235139987 has 2 divisors, whose sum is σ = 235139988. Its totient is φ = 235139986.

The previous prime is 235139969. The next prime is 235140011. The reversal of 235139987 is 789931532.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 235139987 - 2¹⁰ = 235138963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (235139287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 117569993 + 117569994.

It is an arithmetic number, because the mean of its divisors is an integer number (117569994).

Almost surely, 2^235139987 is an apocalyptic number.

235139987 is a deficient number, since it is larger than the sum of its proper divisors (1).

235139987 is an equidigital number, since it uses as much as digits as its factorization.

235139987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 47.

The square root of 235139987 is about 15334.2749094960. The cubic root of 235139987 is about 617.2230883718.

The spelling of 235139987 in words is "two hundred thirty-five million, one hundred thirty-nine thousand, nine hundred eighty-seven".