190009 has 4 divisors (see below), whose sum is σ = 201204. Its totient is φ = 178816.

The previous prime is 189997. The next prime is 190027. The reversal of 190009 is 900091.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 157609 + 32400 = 397^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 190009 - 2⁵ = 189977 is a prime.

It is a super-2 number, since 2×190009² = 72206840162, which contains 22 as substring.

It is a Duffinian number.

190009 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190409) 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, 5572 + ... + 5605.

It is an arithmetic number, because the mean of its divisors is an integer number (50301).

2¹⁹⁰⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

190009 is a deficient number, since it is larger than the sum of its proper divisors (11195).

190009 is a wasteful number, since it uses less digits than its factorization.

190009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11194.

The product of its (nonzero) digits is 81, while the sum is 19.

The square root of 190009 is about 435.9002179398. The cubic root of 190009 is about 57.4898784957.

The spelling of 190009 in words is "one hundred ninety thousand, nine".