870857399 has 2 divisors, whose sum is σ = 870857400. Its totient is φ = 870857398.

The previous prime is 870857333. The next prime is 870857401. The reversal of 870857399 is 993758078.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 870857399 - 2¹⁶ = 870791863 is a prime.

Together with 870857401, 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 (870857599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435428699 + 435428700.

It is an arithmetic number, because the mean of its divisors is an integer number (435428700).

Almost surely, 2^870857399 is an apocalyptic number.

870857399 is a deficient number, since it is larger than the sum of its proper divisors (1).

870857399 is an equidigital number, since it uses as much as digits as its factorization.

870857399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3810240, while the sum is 56.

The square root of 870857399 is about 29510.2931025769. The cubic root of 870857399 is about 954.9537724213.

The spelling of 870857399 in words is "eight hundred seventy million, eight hundred fifty-seven thousand, three hundred ninety-nine".