1355993 has 4 divisors (see below), whose sum is σ = 1389108. Its totient is φ = 1322880.

The previous prime is 1355989. The next prime is 1355999. The reversal of 1355993 is 3995531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3995531 = 1129 ⋅3539.

It can be written as a sum of positive squares in 2 ways, for example, as 299209 + 1056784 = 547^2 + 1028^2 .

It is a cyclic number.

It is not a de Polignac number, because 1355993 - 2² = 1355989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1355999) 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, 16496 + ... + 16577.

It is an arithmetic number, because the mean of its divisors is an integer number (347277).

2^1355993 is an apocalyptic number.

It is an amenable number.

1355993 is a deficient number, since it is larger than the sum of its proper divisors (33115).

1355993 is an equidigital number, since it uses as much as digits as its factorization.

1355993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33114.

The product of its digits is 18225, while the sum is 35.

The square root of 1355993 is about 1164.4711245883. The cubic root of 1355993 is about 110.6842472594.

The spelling of 1355993 in words is "one million, three hundred fifty-five thousand, nine hundred ninety-three".