189565690 has 8 divisors (see below), whose sum is σ = 341218260. Its totient is φ = 75826272.

The previous prime is 189565637. The next prime is 189565699. The reversal of 189565690 is 96565981.

It can be written as a sum of positive squares in 2 ways, for example, as 153289161 + 36276529 = 12381^2 + 6023^2 .

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

It is a super-2 number, since 2×189565690² = 71870301650352200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (189565699) 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, 9478275 + ... + 9478294.

Almost surely, 2^189565690 is an apocalyptic number.

189565690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189565690 is a deficient number, since it is larger than the sum of its proper divisors (151652570).

189565690 is a wasteful number, since it uses less digits than its factorization.

189565690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18956576.

The product of its (nonzero) digits is 583200, while the sum is 49.

The square root of 189565690 is about 13768.2856594421. The cubic root of 189565690 is about 574.4513380098.

The spelling of 189565690 in words is "one hundred eighty-nine million, five hundred sixty-five thousand, six hundred ninety".