1189423872 has 576 divisors, whose sum is σ = 4541931520. Its totient is φ = 298598400.

The previous prime is 1189423861. The next prime is 1189423901. The reversal of 1189423872 is 2783249811.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (576).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19498722 + ... + 19498782.

Almost surely, 2^1189423872 is an apocalyptic number.

1189423872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1189423872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2270965760).

1189423872 is an abundant number, since it is smaller than the sum of its proper divisors (3352507648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1189423872 is a wasteful number, since it uses less digits than its factorization.

1189423872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 117 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 1189423872 is about 34488.0250521830. The cubic root of 1189423872 is about 1059.5274599592.

The spelling of 1189423872 in words is "one billion, one hundred eighty-nine million, four hundred twenty-three thousand, eight hundred seventy-two".