840142 has 8 divisors (see below), whose sum is σ = 1326600. Its totient is φ = 397944.

The previous prime is 840139. The next prime is 840149. The reversal of 840142 is 241048.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840149) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11017 + ... + 11092.

It is an arithmetic number, because the mean of its divisors is an integer number (165825).

2⁸⁴⁰¹⁴² is an apocalyptic number.

840142 is a deficient number, since it is larger than the sum of its proper divisors (486458).

840142 is a wasteful number, since it uses less digits than its factorization.

840142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22130.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 840142 is about 916.5926030686. The cubic root of 840142 is about 94.3591960730.

The spelling of 840142 in words is "eight hundred forty thousand, one hundred forty-two".