840427 has 16 divisors (see below), whose sum is σ = 1036800. Its totient is φ = 665280.

The previous prime is 840353. The next prime is 840439. The reversal of 840427 is 724048.

It is not a de Polignac number, because 840427 - 2⁷ = 840299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9399 + ... + 9487.

It is an arithmetic number, because the mean of its divisors is an integer number (64800).

2⁸⁴⁰⁴²⁷ is an apocalyptic number.

840427 is a deficient number, since it is larger than the sum of its proper divisors (196373).

840427 is a wasteful number, since it uses less digits than its factorization.

840427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186.

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 840427 is about 916.7480569928. The cubic root of 840427 is about 94.3698646388.

The spelling of 840427 in words is "eight hundred forty thousand, four hundred twenty-seven".