856998477 has 36 divisors (see below), whose sum is σ = 1341965820. Its totient is φ = 526559616.

The previous prime is 856998449. The next prime is 856998481. The reversal of 856998477 is 774899658.

It can be written as a sum of positive squares in 2 ways, for example, as 666724041 + 190274436 = 25821^2 + 13794^2 .

It is not a de Polignac number, because 856998477 - 2⁷ = 856998349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856998487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 116649 + ... + 123777.

Almost surely, 2^856998477 is an apocalyptic number.

It is an amenable number.

856998477 is a deficient number, since it is larger than the sum of its proper divisors (484967343).

856998477 is a wasteful number, since it uses less digits than its factorization.

856998477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7210 (or 7188 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 63.

The square root of 856998477 is about 29274.5363242529. The cubic root of 856998477 is about 949.8609129710.

The spelling of 856998477 in words is "eight hundred fifty-six million, nine hundred ninety-eight thousand, four hundred seventy-seven".