840097 has 4 divisors (see below), whose sum is σ = 843696. Its totient is φ = 836500.

The previous prime is 840083. The next prime is 840109. The reversal of 840097 is 790048.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840067) 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, 1423 + ... + 1924.

It is an arithmetic number, because the mean of its divisors is an integer number (210924).

2⁸⁴⁰⁰⁹⁷ is an apocalyptic number.

It is an amenable number.

840097 is a deficient number, since it is larger than the sum of its proper divisors (3599).

840097 is a wasteful number, since it uses less digits than its factorization.

840097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3598.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 840097 is about 916.5680553020. The cubic root of 840097 is about 94.3575113421.

The spelling of 840097 in words is "eight hundred forty thousand, ninety-seven".