870239989 has 2 divisors, whose sum is σ = 870239990. Its totient is φ = 870239988.

The previous prime is 870239987. The next prime is 870240001. The reversal of 870239989 is 989932078.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 706655889 + 163584100 = 26583^2 + 12790^2 .

It is a cyclic number.

It is not a de Polignac number, because 870239989 - 2¹ = 870239987 is a prime.

Together with 870239987, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (870239987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435119994 + 435119995.

It is an arithmetic number, because the mean of its divisors is an integer number (435119995).

Almost surely, 2^870239989 is an apocalyptic number.

It is an amenable number.

870239989 is a deficient number, since it is larger than the sum of its proper divisors (1).

870239989 is an equidigital number, since it uses as much as digits as its factorization.

870239989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 55.

The square root of 870239989 is about 29499.8303215459. The cubic root of 870239989 is about 954.7280418560.

The spelling of 870239989 in words is "eight hundred seventy million, two hundred thirty-nine thousand, nine hundred eighty-nine".