189459817 has 4 divisors (see below), whose sum is σ = 195571456. Its totient is φ = 183348180.

The previous prime is 189459793. The next prime is 189459827. The reversal of 189459817 is 718954981.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189459817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189459827) 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, 3055773 + ... + 3055834.

It is an arithmetic number, because the mean of its divisors is an integer number (48892864).

Almost surely, 2^189459817 is an apocalyptic number.

It is an amenable number.

189459817 is a deficient number, since it is larger than the sum of its proper divisors (6111639).

189459817 is an equidigital number, since it uses as much as digits as its factorization.

189459817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6111638.

The product of its digits is 725760, while the sum is 52.

The square root of 189459817 is about 13764.4403082726. The cubic root of 189459817 is about 574.3443738355.

The spelling of 189459817 in words is "one hundred eighty-nine million, four hundred fifty-nine thousand, eight hundred seventeen".