1605225 has 24 divisors (see below), whose sum is σ = 2812320. Its totient is φ = 805120.

The previous prime is 1605217. The next prime is 1605257. The reversal of 1605225 is 5225061.

It is not a de Polignac number, because 1605225 - 2³ = 1605217 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 646 + ... + 1904.

It is an arithmetic number, because the mean of its divisors is an integer number (117180).

2^1605225 is an apocalyptic number.

1605225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1605225 is a deficient number, since it is larger than the sum of its proper divisors (1207095).

1605225 is a wasteful number, since it uses less digits than its factorization.

1605225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289 (or 1284 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 1605225 is about 1266.9747432368. The cubic root of 1605225 is about 117.0878877957.

It can be divided in two parts, 1605 and 225, that added together give a triangular number (1830 = T₆₀).

The spelling of 1605225 in words is "one million, six hundred five thousand, two hundred twenty-five".