11818554 has 48 divisors (see below), whose sum is σ = 26455296. Its totient is φ = 3516480.

The previous prime is 11818549. The next prime is 11818559. The reversal of 11818554 is 45581811.

11818554 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (11818549) and next prime (11818559).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11818559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52887 + ... + 53109.

It is an arithmetic number, because the mean of its divisors is an integer number (551152).

Almost surely, 2^11818554 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11818554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13227648).

11818554 is an abundant number, since it is smaller than the sum of its proper divisors (14636742).

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

11818554 is a wasteful number, since it uses less digits than its factorization.

11818554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323 (or 312 counting only the distinct ones).

The product of its digits is 6400, while the sum is 33.

The square root of 11818554 is about 3437.8123858058. The cubic root of 11818554 is about 227.7830731446.

The spelling of 11818554 in words is "eleven million, eight hundred eighteen thousand, five hundred fifty-four".