857215730 has 16 divisors (see below), whose sum is σ = 1763415360. Its totient is φ = 293902512.

The previous prime is 857215699. The next prime is 857215739. The reversal of 857215730 is 37512758.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (857215739) 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, 6122900 + ... + 6123039.

It is an arithmetic number, because the mean of its divisors is an integer number (110213460).

Almost surely, 2^857215730 is an apocalyptic number.

857215730 is an abundant number, since it is smaller than the sum of its proper divisors (906199630).

857215730 is a wasteful number, since it uses less digits than its factorization.

857215730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12245953.

The product of its (nonzero) digits is 58800, while the sum is 38.

The square root of 857215730 is about 29278.2467029704. The cubic root of 857215730 is about 949.9411708723.

The spelling of 857215730 in words is "eight hundred fifty-seven million, two hundred fifteen thousand, seven hundred thirty".