1999393 has 4 divisors (see below), whose sum is σ = 2181168. Its totient is φ = 1817620.

The previous prime is 1999379. The next prime is 1999423. The reversal of 1999393 is 3939991.

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: 3939991 = 11 ⋅358181.

It is a cyclic number.

It is not a de Polignac number, because 1999393 - 2⁹ = 1998881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1999303) 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, 90871 + ... + 90892.

It is an arithmetic number, because the mean of its divisors is an integer number (545292).

2^1999393 is an apocalyptic number.

It is an amenable number.

1999393 is a deficient number, since it is larger than the sum of its proper divisors (181775).

1999393 is a wasteful number, since it uses less digits than its factorization.

1999393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181774.

The product of its digits is 59049, while the sum is 43.

The square root of 1999393 is about 1413.9989391792. The cubic root of 1999393 is about 125.9793574985.

The spelling of 1999393 in words is "one million, nine hundred ninety-nine thousand, three hundred ninety-three".