857551944 has 32 divisors (see below), whose sum is σ = 2269991520. Its totient is φ = 269035776.

The previous prime is 857551943. The next prime is 857551949. The reversal of 857551944 is 449155758.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 857551893 and 857551902.

It is not an unprimeable number, because it can be changed into a prime (857551943) 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 7 ways as a sum of consecutive naturals, for example, 1050514 + ... + 1051329.

It is an arithmetic number, because the mean of its divisors is an integer number (70937235).

Almost surely, 2^857551944 is an apocalyptic number.

It is an amenable number.

857551944 is an abundant number, since it is smaller than the sum of its proper divisors (1412439576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

857551944 is a wasteful number, since it uses less digits than its factorization.

857551944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101869 (or 2101865 counting only the distinct ones).

The product of its digits is 1008000, while the sum is 48.

The square root of 857551944 is about 29283.9878431883. The cubic root of 857551944 is about 950.0653487826.

The spelling of 857551944 in words is "eight hundred fifty-seven million, five hundred fifty-one thousand, nine hundred forty-four".