856388499 has 8 divisors (see below), whose sum is σ = 1142507520. Its totient is φ = 570597576.

The previous prime is 856388479. The next prime is 856388513. The reversal of 856388499 is 994883658.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 856388499 - 2²⁰ = 855339923 is a prime.

It is a super-2 number, since 2×856388499² = 1466802522438946002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (856388479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75867 + ... + 86420.

It is an arithmetic number, because the mean of its divisors is an integer number (142813440).

Almost surely, 2^856388499 is an apocalyptic number.

856388499 is a deficient number, since it is larger than the sum of its proper divisors (286119021).

856388499 is a wasteful number, since it uses less digits than its factorization.

856388499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164049.

The product of its digits is 14929920, while the sum is 60.

The square root of 856388499 is about 29264.1162347336. The cubic root of 856388499 is about 949.6355015327.

The spelling of 856388499 in words is "eight hundred fifty-six million, three hundred eighty-eight thousand, four hundred ninety-nine".