1191640 has 32 divisors (see below), whose sum is σ = 2770560. Its totient is φ = 461280.

The previous prime is 1191637. The next prime is 1191643. The reversal of 1191640 is 461911.

It is an interprime number because it is at equal distance from previous prime (1191637) and next prime (1191643).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191643) 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, 38425 + ... + 38455.

It is an arithmetic number, because the mean of its divisors is an integer number (86580).

2^1191640 is an apocalyptic number.

1191640 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 1191640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1385280).

1191640 is an abundant number, since it is smaller than the sum of its proper divisors (1578920).

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

1191640 is an frugal number, since it uses more digits than its factorization.

1191640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1191640 is about 1091.6226454229. The cubic root of 1191640 is about 106.0185086940.

The spelling of 1191640 in words is "one million, one hundred ninety-one thousand, six hundred forty".