857012399 has 4 divisors (see below), whose sum is σ = 857720136. Its totient is φ = 856304664.

The previous prime is 857012393. The next prime is 857012411. The reversal of 857012399 is 993210758.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 857012399 - 2¹² = 857008303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857012393) 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 in 3 ways as a sum of consecutive naturals, for example, 352049 + ... + 354474.

It is an arithmetic number, because the mean of its divisors is an integer number (214430034).

Almost surely, 2^857012399 is an apocalyptic number.

857012399 is a deficient number, since it is larger than the sum of its proper divisors (707737).

857012399 is a wasteful number, since it uses less digits than its factorization.

857012399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707736.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 857012399 is about 29274.7741067288. The cubic root of 857012399 is about 949.8660564620.

The spelling of 857012399 in words is "eight hundred fifty-seven million, twelve thousand, three hundred ninety-nine".