1243188 has 36 divisors (see below), whose sum is σ = 3261440. Its totient is φ = 414072.

The previous prime is 1243181. The next prime is 1243211. The reversal of 1243188 is 8813421.

It is a tau number, because it is divible by the number of its divisors (36).

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 (1243181) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 333 + ... + 1611.

2^1243188 is an apocalyptic number.

1243188 is a gapful number since it is divisible by the number (18) 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 1243188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1630720).

1243188 is an abundant number, since it is smaller than the sum of its proper divisors (2018252).

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

1243188 is a wasteful number, since it uses less digits than its factorization.

1243188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1298 (or 1284 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 1243188 is about 1114.9834079483. The cubic root of 1243188 is about 107.5256978406.

It can be divided in two parts, 1243 and 188, that added together give a triangular number (1431 = T₅₃).

The spelling of 1243188 in words is "one million, two hundred forty-three thousand, one hundred eighty-eight".