1189121472 has 392 divisors, whose sum is σ = 4424184192. Its totient is φ = 307929600.

The previous prime is 1189121449. The next prime is 1189121473. The reversal of 1189121472 is 2741219811.

1189121472 is a `hidden beast` number, since 1 + 189 + 1 + 2 + 1 + 472 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1189121473) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 3592347 + ... + 3592677.

Almost surely, 2^1189121472 is an apocalyptic number.

1189121472 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 1189121472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2212092096).

1189121472 is an abundant number, since it is smaller than the sum of its proper divisors (3235062720).

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

1189121472 is an equidigital number, since it uses as much as digits as its factorization.

1189121472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379 (or 354 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 1189121472 is about 34483.6406430644. The cubic root of 1189121472 is about 1059.4376606683.

It can be divided in two parts, 11891 and 21472, that multiplied together give a palindrome (255323552).

The spelling of 1189121472 in words is "one billion, one hundred eighty-nine million, one hundred twenty-one thousand, four hundred seventy-two".