840051 has 12 divisors (see below), whose sum is σ = 1258712. Its totient is φ = 559872.

The previous prime is 840023. The next prime is 840053. The reversal of 840051 is 150048.

It is not a de Polignac number, because 840051 - 2⁹ = 839539 is a prime.

It is a Duffinian number.

840051 is a lucky 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 840051.

It is not an unprimeable number, because it can be changed into a prime (840053) 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 11 ways as a sum of consecutive naturals, for example, 1486 + ... + 1971.

2⁸⁴⁰⁰⁵¹ is an apocalyptic number.

840051 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

840051 is a deficient number, since it is larger than the sum of its proper divisors (418661).

840051 is an equidigital number, since it uses as much as digits as its factorization.

840051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3472 (or 3460 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 840051 is about 916.5429613499. The cubic root of 840051 is about 94.3557891105.

Adding to 840051 its reverse (150048), we get a palindrome (990099).

The spelling of 840051 in words is "eight hundred forty thousand, fifty-one".