189704657 has 4 divisors (see below), whose sum is σ = 191836260. Its totient is φ = 187573056.

The previous prime is 189704629. The next prime is 189704677. The reversal of 189704657 is 756407981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 756407981 = 7 ⋅108058283.

It can be written as a sum of positive squares in 2 ways, for example, as 28313041 + 161391616 = 5321^2 + 12704^2 .

It is a cyclic number.

It is not a de Polignac number, because 189704657 - 2²⁴ = 172927441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189704677) 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, 1065668 + ... + 1065845.

It is an arithmetic number, because the mean of its divisors is an integer number (47959065).

Almost surely, 2^189704657 is an apocalyptic number.

It is an amenable number.

189704657 is a deficient number, since it is larger than the sum of its proper divisors (2131603).

189704657 is an equidigital number, since it uses as much as digits as its factorization.

189704657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2131602.

The product of its (nonzero) digits is 423360, while the sum is 47.

The square root of 189704657 is about 13773.3313689899. The cubic root of 189704657 is about 574.5916768369.

The spelling of 189704657 in words is "one hundred eighty-nine million, seven hundred four thousand, six hundred fifty-seven".