1191920 has 40 divisors (see below), whose sum is σ = 2839104. Its totient is φ = 465152.

The previous prime is 1191899. The next prime is 1191923. The reversal of 1191920 is 291911.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3602 + ... + 3918.

2^1191920 is an apocalyptic number.

1191920 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 1191920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1419552).

1191920 is an abundant number, since it is smaller than the sum of its proper divisors (1647184).

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

1191920 is a wasteful number, since it uses less digits than its factorization.

1191920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 1191920 is about 1091.7508873365. The cubic root of 1191920 is about 106.0268117770.

Subtracting from 1191920 its reverse (291911), we obtain a palindrome (900009).

The spelling of 1191920 in words is "one million, one hundred ninety-one thousand, nine hundred twenty".