840027 has 4 divisors (see below), whose sum is σ = 1120040. Its totient is φ = 560016.

The previous prime is 840023. The next prime is 840053. The reversal of 840027 is 720048.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 840027 - 2² = 840023 is a prime.

It is a D-number.

It is a Duffinian number.

840027 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 839985 and 840012.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 840027.

It is not an unprimeable number, because it can be changed into a prime (840023) 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, 140002 + ... + 140007.

It is an arithmetic number, because the mean of its divisors is an integer number (280010).

2⁸⁴⁰⁰²⁷ is an apocalyptic number.

840027 is a deficient number, since it is larger than the sum of its proper divisors (280013).

840027 is a wasteful number, since it uses less digits than its factorization.

840027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280012.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 840027 is about 916.5298685804. The cubic root of 840027 is about 94.3548905299.

Adding to 840027 its sum of digits (21), we get a palindrome (840048).

The spelling of 840027 in words is "eight hundred forty thousand, twenty-seven".