1993209 has 4 divisors (see below), whose sum is σ = 2657616. Its totient is φ = 1328804.

The previous prime is 1993193. The next prime is 1993217. The reversal of 1993209 is 9023991.

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.

It is a cyclic number.

It is not a de Polignac number, because 1993209 - 2⁴ = 1993193 is a prime.

It is a D-number.

1993209 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1993209.

It is not an unprimeable number, because it can be changed into a prime (1993219) 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, 332199 + ... + 332204.

It is an arithmetic number, because the mean of its divisors is an integer number (664404).

2^1993209 is an apocalyptic number.

It is an amenable number.

1993209 is a deficient number, since it is larger than the sum of its proper divisors (664407).

1993209 is an equidigital number, since it uses as much as digits as its factorization.

1993209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664406.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 1993209 is about 1411.8105396972. The cubic root of 1993209 is about 125.8493412184.

The spelling of 1993209 in words is "one million, nine hundred ninety-three thousand, two hundred nine".