1930209 has 4 divisors (see below), whose sum is σ = 2573616. Its totient is φ = 1286804.

The previous prime is 1930199. The next prime is 1930219. The reversal of 1930209 is 9020391.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (1930199) and next prime (1930219).

It is a cyclic number.

It is not a de Polignac number, because 1930209 - 2⁵ = 1930177 is a prime.

It is an Ulam number.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1930219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321699 + ... + 321704.

It is an arithmetic number, because the mean of its divisors is an integer number (643404).

2^1930209 is an apocalyptic number.

It is an amenable number.

1930209 is a deficient number, since it is larger than the sum of its proper divisors (643407).

1930209 is an equidigital number, since it uses as much as digits as its factorization.

1930209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643406.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 1930209 is about 1389.3196176546. The cubic root of 1930209 is about 124.5092007845.

The spelling of 1930209 in words is "one million, nine hundred thirty thousand, two hundred nine".