1191720 has 32 divisors (see below), whose sum is σ = 3575520. Its totient is φ = 317760.

The previous prime is 1191719. The next prime is 1191727. The reversal of 1191720 is 271911.

It is not an unprimeable number, because it can be changed into a prime (1191727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4846 + ... + 5085.

It is an arithmetic number, because the mean of its divisors is an integer number (111735).

2^1191720 is an apocalyptic number.

1191720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1191720 is an abundant number, since it is smaller than the sum of its proper divisors (2383800).

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

1191720 is a wasteful number, since it uses less digits than its factorization.

1191720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9945 (or 9941 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 21.

The square root of 1191720 is about 1091.6592875069. The cubic root of 1191720 is about 106.0208811361.

The spelling of 1191720 in words is "one million, one hundred ninety-one thousand, seven hundred twenty".