870642439 has 2 divisors, whose sum is σ = 870642440. Its totient is φ = 870642438.

The previous prime is 870642431. The next prime is 870642467. The reversal of 870642439 is 934246078.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 870642439 - 2³ = 870642431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 870642395 and 870642404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (870642431) 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, 435321219 + 435321220.

It is an arithmetic number, because the mean of its divisors is an integer number (435321220).

Almost surely, 2^870642439 is an apocalyptic number.

870642439 is a deficient number, since it is larger than the sum of its proper divisors (1).

870642439 is an equidigital number, since it uses as much as digits as its factorization.

870642439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 870642439 is about 29506.6507587696. The cubic root of 870642439 is about 954.8751932511.

The spelling of 870642439 in words is "eight hundred seventy million, six hundred forty-two thousand, four hundred thirty-nine".