840820442 has 32 divisors (see below), whose sum is σ = 1664945280. Its totient is φ = 308321280.

The previous prime is 840820439. The next prime is 840820483. The reversal of 840820442 is 244028048.

It is a junction number, because it is equal to n+sod(n) for n = 840820399 and 840820408.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157967 + ... + 163202.

It is an arithmetic number, because the mean of its divisors is an integer number (52029540).

Almost surely, 2^840820442 is an apocalyptic number.

840820442 is a deficient number, since it is larger than the sum of its proper divisors (824124838).

840820442 is a wasteful number, since it uses less digits than its factorization.

840820442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321206.

The product of its (nonzero) digits is 16384, while the sum is 32.

The square root of 840820442 is about 28996.9040071522. The cubic root of 840820442 is about 943.8458861276.

The spelling of 840820442 in words is "eight hundred forty million, eight hundred twenty thousand, four hundred forty-two".