1131720 has 32 divisors (see below), whose sum is σ = 3395520. Its totient is φ = 301760.

The previous prime is 1131701. The next prime is 1131721. The reversal of 1131720 is 271311.

1131720 is nontrivially palindromic in base 11 and base 14.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1131720.

It is not an unprimeable number, because it can be changed into a prime (1131721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4596 + ... + 4835.

It is an arithmetic number, because the mean of its divisors is an integer number (106110).

2^1131720 is an apocalyptic number.

1131720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131720 is an abundant number, since it is smaller than the sum of its proper divisors (2263800).

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

1131720 is a wasteful number, since it uses less digits than its factorization.

1131720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9445 (or 9441 counting only the distinct ones).

The product of its (nonzero) digits is 42, while the sum is 15.

The square root of 1131720 is about 1063.8232935972. The cubic root of 1131720 is about 104.2108640890.

The spelling of 1131720 in words is "one million, one hundred thirty-one thousand, seven hundred twenty".