840452042 has 24 divisors (see below), whose sum is σ = 1333195200. Its totient is φ = 397309608.

The previous prime is 840452017. The next prime is 840452047. The reversal of 840452042 is 240254048.

It is a junction number, because it is equal to n+sod(n) for n = 840451996 and 840452014.

It is not an unprimeable number, because it can be changed into a prime (840452047) 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 11 ways as a sum of consecutive naturals, for example, 518309 + ... + 519927.

It is an arithmetic number, because the mean of its divisors is an integer number (55549800).

Almost surely, 2^840452042 is an apocalyptic number.

840452042 is a deficient number, since it is larger than the sum of its proper divisors (492743158).

840452042 is a wasteful number, since it uses less digits than its factorization.

840452042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2378 (or 2359 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 29.

The square root of 840452042 is about 28990.5509088737. The cubic root of 840452042 is about 943.7080193481.

The spelling of 840452042 in words is "eight hundred forty million, four hundred fifty-two thousand, forty-two".