189812617 has 12 divisors (see below), whose sum is σ = 195801840. Its totient is φ = 183952568.

The previous prime is 189812591. The next prime is 189812639. The reversal of 189812617 is 716218981.

It is a happy number.

It is not a de Polignac number, because 189812617 - 2¹⁹ = 189288329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189812317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 406218 + ... + 406684.

It is an arithmetic number, because the mean of its divisors is an integer number (16316820).

Almost surely, 2^189812617 is an apocalyptic number.

189812617 is the 6889-th decagonal number.

It is an amenable number.

189812617 is a deficient number, since it is larger than the sum of its proper divisors (5989223).

189812617 is an frugal number, since it uses more digits than its factorization.

189812617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692 (or 609 counting only the distinct ones).

The product of its digits is 48384, while the sum is 43.

The square root of 189812617 is about 13777.2499795859. The cubic root of 189812617 is about 574.7006552784.

The spelling of 189812617 in words is "one hundred eighty-nine million, eight hundred twelve thousand, six hundred seventeen".