189657645 has 8 divisors (see below), whose sum is σ = 303452256. Its totient is φ = 101150736.

The previous prime is 189657641. The next prime is 189657679. The reversal of 189657645 is 546756981.

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

It is not a de Polignac number, because 189657645 - 2² = 189657641 is a prime.

It is a super-3 number, since 3×189657645³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189657641) 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, 6321907 + ... + 6321936.

It is an arithmetic number, because the mean of its divisors is an integer number (37931532).

Almost surely, 2^189657645 is an apocalyptic number.

189657645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

189657645 is a deficient number, since it is larger than the sum of its proper divisors (113794611).

189657645 is a wasteful number, since it uses less digits than its factorization.

189657645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12643851.

The product of its digits is 1814400, while the sum is 51.

The square root of 189657645 is about 13771.6246318290. The cubic root of 189657645 is about 574.5442084264.

The spelling of 189657645 in words is "one hundred eighty-nine million, six hundred fifty-seven thousand, six hundred forty-five".