1605993 has 8 divisors (see below), whose sum is σ = 2150688. Its totient is φ = 1065984.

The previous prime is 1605979. The next prime is 1606009. The reversal of 1605993 is 3995061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1605993 - 2¹³ = 1597801 is a prime.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1605913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271 + ... + 1812.

It is an arithmetic number, because the mean of its divisors is an integer number (268836).

2^1605993 is an apocalyptic number.

It is an amenable number.

1605993 is a deficient number, since it is larger than the sum of its proper divisors (544695).

1605993 is a wasteful number, since it uses less digits than its factorization.

1605993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2343.

The product of its (nonzero) digits is 7290, while the sum is 33.

The square root of 1605993 is about 1267.2777911729. The cubic root of 1605993 is about 117.1065579012.

The spelling of 1605993 in words is "one million, six hundred five thousand, nine hundred ninety-three".