1161720 has 96 divisors (see below), whose sum is σ = 4324320. Its totient is φ = 264960.

The previous prime is 1161703. The next prime is 1161749. The reversal of 1161720 is 271611.

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 = 1161693 and 1161702.

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, 2290 + ... + 2750.

It is an arithmetic number, because the mean of its divisors is an integer number (45045).

2^1161720 is an apocalyptic number.

1161720 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 1161720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2162160).

1161720 is an abundant number, since it is smaller than the sum of its proper divisors (3162600).

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

1161720 is a wasteful number, since it uses less digits than its factorization.

1161720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 1161720 is about 1077.8311556083. The cubic root of 1161720 is about 105.1236638215.

It can be divided in two parts, 1161 and 720, that added together give a palindrome (1881).

The spelling of 1161720 in words is "one million, one hundred sixty-one thousand, seven hundred twenty".