855644457 has 16 divisors (see below), whose sum is σ = 1174259520. Its totient is φ = 553862400.

The previous prime is 855644431. The next prime is 855644467. The reversal of 855644457 is 754446558.

It is not a de Polignac number, because 855644457 - 2⁶ = 855644393 is a prime.

It is a super-3 number, since 3×855644457³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (855644407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9469 + ... + 42437.

It is an arithmetic number, because the mean of its divisors is an integer number (73391220).

Almost surely, 2^855644457 is an apocalyptic number.

It is an amenable number.

855644457 is a deficient number, since it is larger than the sum of its proper divisors (318615063).

855644457 is a wasteful number, since it uses less digits than its factorization.

855644457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33224.

The product of its digits is 2688000, while the sum is 48.

The square root of 855644457 is about 29251.4009408097. The cubic root of 855644457 is about 949.3604030920.

The spelling of 855644457 in words is "eight hundred fifty-five million, six hundred forty-four thousand, four hundred fifty-seven".