1143720 has 80 divisors (see below), whose sum is σ = 3855060. Its totient is φ = 304128.

The previous prime is 1143719. The next prime is 1143749. The reversal of 1143720 is 273411.

It can be written as a sum of positive squares in 2 ways, for example, as 1127844 + 15876 = 1062^2 + 126^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1143693 and 1143702.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3064 + ... + 3416.

2^1143720 is an apocalyptic number.

1143720 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 1143720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1927530).

1143720 is an abundant number, since it is smaller than the sum of its proper divisors (2711340).

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

1143720 is a wasteful number, since it uses less digits than its factorization.

1143720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376 (or 363 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 1143720 is about 1069.4484559809. The cubic root of 1143720 is about 104.5778972464.

The spelling of 1143720 in words is "one million, one hundred forty-three thousand, seven hundred twenty".