815858042 has 16 divisors (see below), whose sum is σ = 1244860800. Its totient is φ = 400915440.

The previous prime is 815858039. The next prime is 815858059. The reversal of 815858042 is 240858518.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227459 + ... + 231017.

It is an arithmetic number, because the mean of its divisors is an integer number (77803800).

Almost surely, 2^815858042 is an apocalyptic number.

815858042 is a deficient number, since it is larger than the sum of its proper divisors (429002758).

815858042 is a wasteful number, since it uses less digits than its factorization.

815858042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5501.

The product of its (nonzero) digits is 102400, while the sum is 41.

The square root of 815858042 is about 28563.2288440925. The cubic root of 815858042 is about 934.4115534400.

The spelling of 815858042 in words is "eight hundred fifteen million, eight hundred fifty-eight thousand, forty-two".