840025 has 6 divisors (see below), whose sum is σ = 1041662. Its totient is φ = 672000.

The previous prime is 840023. The next prime is 840053. The reversal of 840025 is 520048.

It is a happy number.

840025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 8281 + 831744 = 91^2 + 912^2 .

It is not a de Polignac number, because 840025 - 2¹ = 840023 is a prime.

It is a Duffinian number.

840025 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 839984 and 840011.

It is not an unprimeable number, because it can be changed into a prime (840023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16776 + ... + 16825.

2⁸⁴⁰⁰²⁵ is an apocalyptic number.

It is an amenable number.

840025 is a deficient number, since it is larger than the sum of its proper divisors (201637).

840025 is a wasteful number, since it uses less digits than its factorization.

840025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33611 (or 33606 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 840025 is about 916.5287775078. The cubic root of 840025 is about 94.3548156474.

The spelling of 840025 in words is "eight hundred forty thousand, twenty-five".