11281830 has 64 divisors (see below), whose sum is σ = 31961088. Its totient is φ = 2494080.

The previous prime is 11281819. The next prime is 11281843. The reversal of 11281830 is 3818211.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 11281830.

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 31 ways as a sum of consecutive naturals, for example, 5644 + ... + 7376.

It is an arithmetic number, because the mean of its divisors is an integer number (499392).

Almost surely, 2^11281830 is an apocalyptic number.

11281830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11281830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15980544).

11281830 is an abundant number, since it is smaller than the sum of its proper divisors (20679258).

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

11281830 is a wasteful number, since it uses less digits than its factorization.

11281830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1781.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 11281830 is about 3358.8435509860. The cubic root of 11281830 is about 224.2813614698.

The spelling of 11281830 in words is "eleven million, two hundred eighty-one thousand, eight hundred thirty".