11890840 has 48 divisors (see below), whose sum is σ = 28987200. Its totient is φ = 4387968.

The previous prime is 11890807. The next prime is 11890873. The reversal of 11890840 is 4809811.

It is an interprime number because it is at equal distance from previous prime (11890807) and next prime (11890873).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 5881 + ... + 7639.

It is an arithmetic number, because the mean of its divisors is an integer number (603900).

Almost surely, 2^11890840 is an apocalyptic number.

11890840 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 11890840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14493600).

11890840 is an abundant number, since it is smaller than the sum of its proper divisors (17096360).

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

11890840 is a wasteful number, since it uses less digits than its factorization.

11890840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1796 (or 1779 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 11890840 is about 3448.3097308682. The cubic root of 11890840 is about 228.2465272292.

The spelling of 11890840 in words is "eleven million, eight hundred ninety thousand, eight hundred forty".