857942930 has 16 divisors (see below), whose sum is σ = 1663089624. Its totient is φ = 316778880.

The previous prime is 857942903. The next prime is 857942933. The reversal of 857942930 is 39249758.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 703363441 + 154579489 = 26521^2 + 12433^2 .

It is a super-2 number, since 2×857942930² = 1472132142273969800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (857942933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3299651 + ... + 3299910.

Almost surely, 2^857942930 is an apocalyptic number.

857942930 is a deficient number, since it is larger than the sum of its proper divisors (805146694).

857942930 is a wasteful number, since it uses less digits than its factorization.

857942930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6599581.

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 857942930 is about 29290.6628467162. The cubic root of 857942930 is about 950.2097154741.

The spelling of 857942930 in words is "eight hundred fifty-seven million, nine hundred forty-two thousand, nine hundred thirty".