1143991296 has 352 divisors, whose sum is σ = 4056007680. Its totient is φ = 311427072.

The previous prime is 1143991291. The next prime is 1143991309. The reversal of 1143991296 is 6921993411.

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

It is not an unprimeable number, because it can be changed into a prime (1143991291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4451200 + ... + 4451456.

Almost surely, 2^1143991296 is an apocalyptic number.

1143991296 is a gapful number since it is divisible by the number (16) 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 1143991296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2028003840).

1143991296 is an abundant number, since it is smaller than the sum of its proper divisors (2912016384).

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

1143991296 is a wasteful number, since it uses less digits than its factorization.

1143991296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316 (or 292 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 1143991296 is about 33822.9403807534. The cubic root of 1143991296 is about 1045.8616538961.

The spelling of 1143991296 in words is "one billion, one hundred forty-three million, nine hundred ninety-one thousand, two hundred ninety-six".