189645709 has 8 divisors (see below), whose sum is σ = 207412128. Its totient is φ = 171966960.

The previous prime is 189645637. The next prime is 189645737. The reversal of 189645709 is 907546981.

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

It is not a de Polignac number, because 189645709 - 2¹¹ = 189643661 is a prime.

It is a super-2 number, since 2×189645709² = 71930989884225362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189645779) 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, 17347 + ... + 26080.

It is an arithmetic number, because the mean of its divisors is an integer number (25926516).

Almost surely, 2^189645709 is an apocalyptic number.

It is an amenable number.

189645709 is a deficient number, since it is larger than the sum of its proper divisors (17766419).

189645709 is a wasteful number, since it uses less digits than its factorization.

189645709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43835.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 189645709 is about 13771.1912701843. The cubic root of 189645709 is about 574.5321552985.

The spelling of 189645709 in words is "one hundred eighty-nine million, six hundred forty-five thousand, seven hundred nine".