855406857 has 8 divisors (see below), whose sum is σ = 1153357920. Its totient is φ = 563863520.

The previous prime is 855406831. The next prime is 855406861. The reversal of 855406857 is 758604558.

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

It is a cyclic number.

It is not a de Polignac number, because 855406857 - 2⁷ = 855406729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (855406817) 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, 1601619 + ... + 1602152.

It is an arithmetic number, because the mean of its divisors is an integer number (144169740).

Almost surely, 2^855406857 is an apocalyptic number.

It is an amenable number.

855406857 is a deficient number, since it is larger than the sum of its proper divisors (297951063).

855406857 is a wasteful number, since it uses less digits than its factorization.

855406857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3203863.

The product of its (nonzero) digits is 1344000, while the sum is 48.

The square root of 855406857 is about 29247.3393148847. The cubic root of 855406857 is about 949.2725204393.

The spelling of 855406857 in words is "eight hundred fifty-five million, four hundred six thousand, eight hundred fifty-seven".