189666413 has 4 divisors (see below), whose sum is σ = 189863520. Its totient is φ = 189469308.

The previous prime is 189666391. The next prime is 189666437. The reversal of 189666413 is 314666981.

It is a happy number.

189666413 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 314666981 = 37 ⋅8504513.

It is a cyclic number.

It is not a de Polignac number, because 189666413 - 2¹⁸ = 189404269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189666443) 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, 97103 + ... + 99036.

It is an arithmetic number, because the mean of its divisors is an integer number (47465880).

Almost surely, 2^189666413 is an apocalyptic number.

It is an amenable number.

189666413 is a deficient number, since it is larger than the sum of its proper divisors (197107).

189666413 is an equidigital number, since it uses as much as digits as its factorization.

189666413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197106.

The product of its digits is 186624, while the sum is 44.

The square root of 189666413 is about 13771.9429638668. The cubic root of 189666413 is about 574.5530621445.

The spelling of 189666413 in words is "one hundred eighty-nine million, six hundred sixty-six thousand, four hundred thirteen".