857221936 has 30 divisors (see below), whose sum is σ = 1752894132. Its totient is φ = 406049760.

The previous prime is 857221927. The next prime is 857221961. The reversal of 857221936 is 639122758.

It is a junction number, because it is equal to n+sod(n) for n = 857221892 and 857221901.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68430 + ... + 79981.

Almost surely, 2^857221936 is an apocalyptic number.

It is an amenable number.

857221936 is an abundant number, since it is smaller than the sum of its proper divisors (895672196).

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

857221936 is a wasteful number, since it uses less digits than its factorization.

857221936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148457 (or 148432 counting only the distinct ones).

The product of its digits is 181440, while the sum is 43.

The square root of 857221936 is about 29278.3526859009. The cubic root of 857221936 is about 949.9434633021.

The spelling of 857221936 in words is "eight hundred fifty-seven million, two hundred twenty-one thousand, nine hundred thirty-six".