239996999987 has 2 divisors, whose sum is σ = 239996999988. Its totient is φ = 239996999986.

The previous prime is 239996999947. The next prime is 239997000053. The reversal of 239996999987 is 789999699932.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 239996999987 - 2⁶ = 239996999923 is a prime.

It is not a weakly prime, because it can be changed into another prime (239996999927) 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, 119998499993 + 119998499994.

It is an arithmetic number, because the mean of its divisors is an integer number (119998499994).

Almost surely, 2^239996999987 is an apocalyptic number.

239996999987 is a deficient number, since it is larger than the sum of its proper divisors (1).

239996999987 is an equidigital number, since it uses as much as digits as its factorization.

239996999987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9642465504, while the sum is 89.

The spelling of 239996999987 in words is "two hundred thirty-nine billion, nine hundred ninety-six million, nine hundred ninety-nine thousand, nine hundred eighty-seven".