842478 has 32 divisors (see below), whose sum is σ = 2075136. Its totient is φ = 222048.

The previous prime is 842477. The next prime is 842483. The reversal of 842478 is 874248.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 842478.

It is not an unprimeable number, because it can be changed into a prime (842473) 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 15 ways as a sum of consecutive naturals, for example, 226 + ... + 1317.

It is an arithmetic number, because the mean of its divisors is an integer number (64848).

2⁸⁴²⁴⁷⁸ is an apocalyptic number.

842478 is an abundant number, since it is smaller than the sum of its proper divisors (1232658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

842478 is a wasteful number, since it uses less digits than its factorization.

842478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1568.

The product of its digits is 14336, while the sum is 33.

The square root of 842478 is about 917.8660032924. The cubic root of 842478 is about 94.4465698355.

It can be divided in two parts, 84247 and 8, that added together give a triangular number (84255 = T₄₁₀).

The spelling of 842478 in words is "eight hundred forty-two thousand, four hundred seventy-eight".