840007 has 16 divisors (see below), whose sum is σ = 1024000. Its totient is φ = 687960.

The previous prime is 839999. The next prime is 840023. The reversal of 840007 is 700048.

It is a happy number.

840007 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 840007 - 2³ = 839999 is a prime.

It is a super-2 number, since 2×840007² = 1411223520098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 10594 + ... + 10672.

It is an arithmetic number, because the mean of its divisors is an integer number (64000).

2⁸⁴⁰⁰⁰⁷ is an apocalyptic number.

840007 is a deficient number, since it is larger than the sum of its proper divisors (183993).

840007 is an equidigital number, since it uses as much as digits as its factorization.

840007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 840007 is about 916.5189577963. The cubic root of 840007 is about 94.3541416997.

The spelling of 840007 in words is "eight hundred forty thousand, seven".