190505789 has 4 divisors (see below), whose sum is σ = 190560480. Its totient is φ = 190451100.

The previous prime is 190505779. The next prime is 190505807. The reversal of 190505789 is 987505091.

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, and also an emirpimes, since its reverse is a distinct semiprime: 987505091 = 73 ⋅13527467.

It is a cyclic number.

It is not a de Polignac number, because 190505789 - 2⁴ = 190505773 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 (190505719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21737 + ... + 29214.

It is an arithmetic number, because the mean of its divisors is an integer number (47640120).

Almost surely, 2^190505789 is an apocalyptic number.

It is an amenable number.

190505789 is a deficient number, since it is larger than the sum of its proper divisors (54691).

190505789 is an equidigital number, since it uses as much as digits as its factorization.

190505789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54690.

The product of its (nonzero) digits is 113400, while the sum is 44.

The square root of 190505789 is about 13802.3834535924. The cubic root of 190505789 is about 575.3993837792.

The spelling of 190505789 in words is "one hundred ninety million, five hundred five thousand, seven hundred eighty-nine".