1191840 has 96 divisors (see below), whose sum is σ = 4064256. Its totient is φ = 291840.

The previous prime is 1191833. The next prime is 1191847. The reversal of 1191840 is 481911.

It is an interprime number because it is at equal distance from previous prime (1191833) and next prime (1191847).

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1191840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6145 + ... + 6335.

It is an arithmetic number, because the mean of its divisors is an integer number (42336).

2^1191840 is an apocalyptic number.

1191840 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 1191840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2032128).

1191840 is an abundant number, since it is smaller than the sum of its proper divisors (2872416).

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

1191840 is a wasteful number, since it uses less digits than its factorization.

1191840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 1191840 is about 1091.7142483269. The cubic root of 1191840 is about 106.0244396003.

The spelling of 1191840 in words is "one million, one hundred ninety-one thousand, eight hundred forty".