1605493 has 4 divisors (see below), whose sum is σ = 1608160. Its totient is φ = 1602828.

The previous prime is 1605433. The next prime is 1605509. The reversal of 1605493 is 3945061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3945061 = 41 ⋅96221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1605493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46 + ... + 1792.

It is an arithmetic number, because the mean of its divisors is an integer number (402040).

2^1605493 is an apocalyptic number.

It is an amenable number.

1605493 is a deficient number, since it is larger than the sum of its proper divisors (2667).

1605493 is an equidigital number, since it uses as much as digits as its factorization.

1605493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2666.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1605493 is about 1267.0805025727. The cubic root of 1605493 is about 117.0944035609.

The spelling of 1605493 in words is "one million, six hundred five thousand, four hundred ninety-three".