1189689394 has 4 divisors (see below), whose sum is σ = 1784534094. Its totient is φ = 594844696.

The previous prime is 1189689377. The next prime is 1189689401. The reversal of 1189689394 is 4939869811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4939869811 = 47 ⋅105103613.

It can be written as a sum of positive squares in only one way, i.e., 1121379169 + 68310225 = 33487^2 + 8265^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 297422347 + ... + 297422350.

Almost surely, 2^1189689394 is an apocalyptic number.

1189689394 is a deficient number, since it is larger than the sum of its proper divisors (594844700).

1189689394 is an equidigital number, since it uses as much as digits as its factorization.

1189689394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594844699.

The product of its digits is 3359232, while the sum is 58.

The square root of 1189689394 is about 34491.8743184536. The cubic root of 1189689394 is about 1059.6062955829.

The spelling of 1189689394 in words is "one billion, one hundred eighty-nine million, six hundred eighty-nine thousand, three hundred ninety-four".