840225 has 24 divisors (see below), whose sum is σ = 1473120. Its totient is φ = 421120.

The previous prime is 840223. The next prime is 840239. The reversal of 840225 is 522048.

It is not a de Polignac number, because 840225 - 2¹ = 840223 is a prime.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (840223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 946 + ... + 1604.

It is an arithmetic number, because the mean of its divisors is an integer number (61380).

2⁸⁴⁰²²⁵ is an apocalyptic number.

840225 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

840225 is a deficient number, since it is larger than the sum of its proper divisors (632895).

840225 is a wasteful number, since it uses less digits than its factorization.

840225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689 (or 684 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 840225 is about 916.6378783358. The cubic root of 840225 is about 94.3623033078.

The spelling of 840225 in words is "eight hundred forty thousand, two hundred twenty-five".