840297 has 4 divisors (see below), whose sum is σ = 1120400. Its totient is φ = 560196.

The previous prime is 840289. The next prime is 840299. The reversal of 840297 is 792048.

840297 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 840297 - 2³ = 840289 is a prime.

It is a D-number.

It is a Duffinian number.

840297 is a modest number, since divided by 297 gives 84 as remainder.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 840297.

It is not an unprimeable number, because it can be changed into a prime (840299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140047 + ... + 140052.

It is an arithmetic number, because the mean of its divisors is an integer number (280100).

2⁸⁴⁰²⁹⁷ is an apocalyptic number.

It is an amenable number.

840297 is a deficient number, since it is larger than the sum of its proper divisors (280103).

840297 is a wasteful number, since it uses less digits than its factorization.

840297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280102.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 840297 is about 916.6771514552. The cubic root of 840297 is about 94.3649985747.

The spelling of 840297 in words is "eight hundred forty thousand, two hundred ninety-seven".