840257242 has 16 divisors (see below), whose sum is σ = 1375424064. Its totient is φ = 381808000.

The previous prime is 840257233. The next prime is 840257261. The reversal of 840257242 is 242752048.

840257242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 840257198 and 840257207.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103242 + ... + 111082.

It is an arithmetic number, because the mean of its divisors is an integer number (85964004).

Almost surely, 2^840257242 is an apocalyptic number.

840257242 is a deficient number, since it is larger than the sum of its proper divisors (535166822).

840257242 is a wasteful number, since it uses less digits than its factorization.

840257242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12725.

The product of its (nonzero) digits is 35840, while the sum is 34.

The square root of 840257242 is about 28987.1909987843. The cubic root of 840257242 is about 943.6351028230.

The spelling of 840257242 in words is "eight hundred forty million, two hundred fifty-seven thousand, two hundred forty-two".