1605423 has 16 divisors (see below), whose sum is σ = 2280960. Its totient is φ = 1002144.

The previous prime is 1605421. The next prime is 1605427. The reversal of 1605423 is 3245061.

It is a happy number.

It is not a de Polignac number, because 1605423 - 2¹ = 1605421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1605423.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 3438 + ... + 3876.

It is an arithmetic number, because the mean of its divisors is an integer number (142560).

2^1605423 is an apocalyptic number.

1605423 is a deficient number, since it is larger than the sum of its proper divisors (675537).

1605423 is a wasteful number, since it uses less digits than its factorization.

1605423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1605423 is about 1267.0528797173. The cubic root of 1605423 is about 117.0927017519.

The spelling of 1605423 in words is "one million, six hundred five thousand, four hundred twenty-three".