840147 has 16 divisors (see below), whose sum is σ = 1396992. Its totient is φ = 436320.

The previous prime is 840139. The next prime is 840149. The reversal of 840147 is 741048.

It is not a de Polignac number, because 840147 - 2³ = 840139 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 840147.

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 15 ways as a sum of consecutive naturals, for example, 1588 + ... + 2049.

It is an arithmetic number, because the mean of its divisors is an integer number (87312).

2⁸⁴⁰¹⁴⁷ is an apocalyptic number.

840147 is a deficient number, since it is larger than the sum of its proper divisors (556845).

840147 is a wasteful number, since it uses less digits than its factorization.

840147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3658.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 840147 is about 916.5953305576. The cubic root of 840147 is about 94.3593832616.

Subtracting from 840147 its reverse (741048), we obtain a palindrome (99099).

It can be divided in two parts, 8401 and 47, that added together give a palindrome (8448).

The spelling of 840147 in words is "eight hundred forty thousand, one hundred forty-seven".