857283138 has 12 divisors (see below), whose sum is σ = 1857446838. Its totient is φ = 285761040.

The previous prime is 857283107. The next prime is 857283139. The reversal of 857283138 is 831382758.

It can be written as a sum of positive squares in only one way, i.e., 855387009 + 1896129 = 29247^2 + 1377^2 .

It is a junction number, because it is equal to n+sod(n) for n = 857283093 and 857283102.

It is not an unprimeable number, because it can be changed into a prime (857283139) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23813403 + ... + 23813438.

Almost surely, 2^857283138 is an apocalyptic number.

857283138 is an abundant number, since it is smaller than the sum of its proper divisors (1000163700).

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

857283138 is a wasteful number, since it uses less digits than its factorization.

857283138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47626849 (or 47626846 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 857283138 is about 29279.3978421688. The cubic root of 857283138 is about 949.9660700717.

The spelling of 857283138 in words is "eight hundred fifty-seven million, two hundred eighty-three thousand, one hundred thirty-eight".