1189638149 has 16 divisors (see below), whose sum is σ = 1380804480. Its totient is φ = 1003829760.

The previous prime is 1189638143. The next prime is 1189638199. The reversal of 1189638149 is 9418369811.

It is a cyclic number.

It is not a de Polignac number, because 1189638149 - 2¹² = 1189634053 is a prime.

It is a super-2 number, since 2×1189638149² = 2830477851112292402, which contains 22 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1189638097 and 1189638106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1189638143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 314429 + ... + 318189.

It is an arithmetic number, because the mean of its divisors is an integer number (86300280).

Almost surely, 2^1189638149 is an apocalyptic number.

It is an amenable number.

1189638149 is a deficient number, since it is larger than the sum of its proper divisors (191166331).

1189638149 is an equidigital number, since it uses as much as digits as its factorization.

1189638149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4460.

The product of its digits is 373248, while the sum is 50.

The square root of 1189638149 is about 34491.1314543319. The cubic root of 1189638149 is about 1059.5910814426.

The spelling of 1189638149 in words is "one billion, one hundred eighty-nine million, six hundred thirty-eight thousand, one hundred forty-nine".