1605425 has 6 divisors (see below), whose sum is σ = 1990758. Its totient is φ = 1284320.

The previous prime is 1605421. The next prime is 1605427. The reversal of 1605425 is 5245061.

1605425 = T₂₂₈ + T₂₂₉ + ... + T₂₇₇.

It can be written as a sum of positive squares in 3 ways, for example, as 27889 + 1577536 = 167^2 + 1256^2 .

It is not a de Polignac number, because 1605425 - 2² = 1605421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1605425.

It is not an unprimeable number, because it can be changed into a prime (1605421) 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, 32084 + ... + 32133.

It is an arithmetic number, because the mean of its divisors is an integer number (331793).

2^1605425 is an apocalyptic number.

It is an amenable number.

1605425 is a deficient number, since it is larger than the sum of its proper divisors (385333).

1605425 is an equidigital number, since it uses as much as digits as its factorization.

1605425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64227 (or 64222 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1605425 is about 1267.0536689501. The cubic root of 1605425 is about 117.0927503757.

The spelling of 1605425 in words is "one million, six hundred five thousand, four hundred twenty-five".