1143558 has 48 divisors (see below), whose sum is σ = 2782416. Its totient is φ = 349920.

The previous prime is 1143551. The next prime is 1143563. The reversal of 1143558 is 8553411.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143551) 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, 6228 + ... + 6408.

It is an arithmetic number, because the mean of its divisors is an integer number (57967).

2^1143558 is an apocalyptic number.

1143558 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1143558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1391208).

1143558 is an abundant number, since it is smaller than the sum of its proper divisors (1638858).

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

1143558 is a wasteful number, since it uses less digits than its factorization.

1143558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211 (or 199 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 1143558 is about 1069.3727133231. The cubic root of 1143558 is about 104.5729594355.

Adding to 1143558 its reverse (8553411), we get a palindrome (9696969).

The spelling of 1143558 in words is "one million, one hundred forty-three thousand, five hundred fifty-eight".