11912550 has 96 divisors (see below), whose sum is σ = 32810400. Its totient is φ = 2841600.

The previous prime is 11912531. The next prime is 11912569. The reversal of 11912550 is 5521911.

It is an interprime number because it is at equal distance from previous prime (11912531) and next prime (11912569).

It is a self number, because there is not a number n which added to its sum of digits gives 11912550.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 79876 + ... + 80024.

It is an arithmetic number, because the mean of its divisors is an integer number (341775).

Almost surely, 2^11912550 is an apocalyptic number.

11912550 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 11912550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16405200).

11912550 is an abundant number, since it is smaller than the sum of its proper divisors (20897850).

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

11912550 is a wasteful number, since it uses less digits than its factorization.

11912550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218 (or 213 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 24.

The square root of 11912550 is about 3451.4562144115. The cubic root of 11912550 is about 228.3853517207.

It can be divided in two parts, 1191 and 2550, that added together give a triangular number (3741 = T₈₆).

The spelling of 11912550 in words is "eleven million, nine hundred twelve thousand, five hundred fifty".