1171720 has 32 divisors (see below), whose sum is σ = 2877120. Its totient is φ = 425920.

The previous prime is 1171699. The next prime is 1171721. The reversal of 1171720 is 271711.

It is not an unprimeable number, because it can be changed into a prime (1171721) 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, 892 + ... + 1771.

It is an arithmetic number, because the mean of its divisors is an integer number (89910).

2^1171720 is an apocalyptic number.

1171720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1171720 is an abundant number, since it is smaller than the sum of its proper divisors (1705400).

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

1171720 is a wasteful number, since it uses less digits than its factorization.

1171720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2685 (or 2681 counting only the distinct ones).

The product of its (nonzero) digits is 98, while the sum is 19.

The square root of 1171720 is about 1082.4601609297. The cubic root of 1171720 is about 105.4244347066.

Subtracting from 1171720 its reverse (271711), we obtain a palindrome (900009).

It can be divided in two parts, 1171 and 720, that added together give a triangular number (1891 = T₆₁).

The spelling of 1171720 in words is "one million, one hundred seventy-one thousand, seven hundred twenty".