1143720720 has 120 divisors (see below), whose sum is σ = 3904112472. Its totient is φ = 299980800.

The previous prime is 1143720703. The next prime is 1143720737. The reversal of 1143720720 is 270273411.

It is a happy number.

1143720720 is a `hidden beast` number, since 1 + 1 + 437 + 207 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (1143720703) and next prime (1143720737).

It can be written as a sum of positive squares in 4 ways, for example, as 88510464 + 1055210256 = 9408^2 + 32484^2 .

It is a tau number, because it is divible by the number of its divisors (120).

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, 30900 + ... + 56940.

Almost surely, 2^1143720720 is an apocalyptic number.

1143720720 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 1143720720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1952056236).

1143720720 is an abundant number, since it is smaller than the sum of its proper divisors (2760391752).

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

1143720720 is a wasteful number, since it uses less digits than its factorization.

1143720720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26121 (or 26112 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 1143720720 is about 33818.9402554249. The cubic root of 1143720720 is about 1045.7791919119.

The spelling of 1143720720 in words is "one billion, one hundred forty-three million, seven hundred twenty thousand, seven hundred twenty".