11291840 has 84 divisors (see below), whose sum is σ = 31168848. Its totient is φ = 3816960.

The previous prime is 11291831. The next prime is 11291849. The reversal of 11291840 is 4819211.

It is an interprime number because it is at equal distance from previous prime (11291831) and next prime (11291849).

It is not an unprimeable number, because it can be changed into a prime (11291849) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159005 + ... + 159075.

Almost surely, 2^11291840 is an apocalyptic number.

11291840 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 11291840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15584424).

11291840 is an abundant number, since it is smaller than the sum of its proper divisors (19877008).

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

11291840 is an frugal number, since it uses more digits than its factorization.

11291840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 11291840 is about 3360.3333168006. Note that the first 4 decimals coincide. The cubic root of 11291840 is about 224.3476743750.

The spelling of 11291840 in words is "eleven million, two hundred ninety-one thousand, eight hundred forty".