856604397 has 16 divisors (see below), whose sum is σ = 1247042880. Its totient is φ = 518707200.

The previous prime is 856604393. The next prime is 856604453. The reversal of 856604397 is 793406658.

It is not a de Polignac number, because 856604397 - 2² = 856604393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856604393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29997 + ... + 51117.

It is an arithmetic number, because the mean of its divisors is an integer number (77940180).

Almost surely, 2^856604397 is an apocalyptic number.

It is an amenable number.

856604397 is a deficient number, since it is larger than the sum of its proper divisors (390438483).

856604397 is a wasteful number, since it uses less digits than its factorization.

856604397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22364.

The product of its (nonzero) digits is 1088640, while the sum is 48.

The square root of 856604397 is about 29267.8047861468. The cubic root of 856604397 is about 949.7152967733.

The spelling of 856604397 in words is "eight hundred fifty-six million, six hundred four thousand, three hundred ninety-seven".