1191240 has 64 divisors (see below), whose sum is σ = 3974400. Its totient is φ = 317376.

The previous prime is 1191221. The next prime is 1191247. The reversal of 1191240 is 421911.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1191247) 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, 529 + ... + 1631.

It is an arithmetic number, because the mean of its divisors is an integer number (62100).

2^1191240 is an apocalyptic number.

1191240 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 1191240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1987200).

1191240 is an abundant number, since it is smaller than the sum of its proper divisors (2783160).

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

1191240 is a wasteful number, since it uses less digits than its factorization.

1191240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123 (or 1113 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1191240 is about 1091.4394165505. The cubic root of 1191240 is about 106.0066448902.

It can be divided in two parts, 1191 and 240, that added together give a triangular number (1431 = T₅₃).

The spelling of 1191240 in words is "one million, one hundred ninety-one thousand, two hundred forty".