11381780 has 48 divisors (see below), whose sum is σ = 25280640. Its totient is φ = 4295808.

The previous prime is 11381761. The next prime is 11381813. The reversal of 11381780 is 8718311.

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 15 ways as a sum of consecutive naturals, for example, 50027 + ... + 50253.

It is an arithmetic number, because the mean of its divisors is an integer number (526680).

Almost surely, 2^11381780 is an apocalyptic number.

11381780 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 11381780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12640320).

11381780 is an abundant number, since it is smaller than the sum of its proper divisors (13898860).

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

11381780 is a wasteful number, since it uses less digits than its factorization.

11381780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 29.

The square root of 11381780 is about 3373.6893751500. The cubic root of 11381780 is about 224.9417462359.

The spelling of 11381780 in words is "eleven million, three hundred eighty-one thousand, seven hundred eighty".