1143889920 has 336 divisors, whose sum is σ = 4140311760. Its totient is φ = 291766272.

The previous prime is 1143889909. The next prime is 1143889933. The reversal of 1143889920 is 299883411.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10690507 + ... + 10690613.

Almost surely, 2^1143889920 is an apocalyptic number.

1143889920 is a gapful number since it is divisible by the number (10) 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 1143889920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2070155880).

1143889920 is an abundant number, since it is smaller than the sum of its proper divisors (2996421840).

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

1143889920 is a wasteful number, since it uses less digits than its factorization.

1143889920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 1143889920 is about 33821.4417197138. The cubic root of 1143889920 is about 1045.8307596042.

The spelling of 1143889920 in words is "one billion, one hundred forty-three million, eight hundred eighty-nine thousand, nine hundred twenty".