189790 has 8 divisors (see below), whose sum is σ = 341640. Its totient is φ = 75912.

The previous prime is 189767. The next prime is 189797. The reversal of 189790 is 97981.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9480 + ... + 9499.

It is an arithmetic number, because the mean of its divisors is an integer number (42705).

2¹⁸⁹⁷⁹⁰ is an apocalyptic number.

189790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189790 is a deficient number, since it is larger than the sum of its proper divisors (151850).

189790 is a wasteful number, since it uses less digits than its factorization.

189790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18986.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 189790 is about 435.6489412359. The cubic root of 189790 is about 57.4677828343.

Subtracting from 189790 its reverse (97981), we obtain a square (91809 = 303²).

It can be divided in two parts, 189 and 790, that added together give a palindrome (979).

The spelling of 189790 in words is "one hundred eighty-nine thousand, seven hundred ninety".