190805 has 8 divisors (see below), whose sum is σ = 236544. Its totient is φ = 147600.

The previous prime is 190793. The next prime is 190807. The reversal of 190805 is 508091.

Added to its reverse (508091) it gives a square (698896 = 836²).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 190805 - 2¹² = 186709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 461 + ... + 770.

It is an arithmetic number, because the mean of its divisors is an integer number (29568).

2¹⁹⁰⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

190805 is a deficient number, since it is larger than the sum of its proper divisors (45739).

190805 is a wasteful number, since it uses less digits than its factorization.

190805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 190805 is about 436.8123166762. The cubic root of 190805 is about 57.5700469587.

Adding to 190805 its reverse (508091), we get a palindrome (698896).

The spelling of 190805 in words is "one hundred ninety thousand, eight hundred five".