1243136 has 24 divisors (see below), whose sum is σ = 2489760. Its totient is φ = 620544.

The previous prime is 1243133. The next prime is 1243141. The reversal of 1243136 is 6313421.

It is a super-2 number, since 2×1243136² = 3090774228992, which contains 22 as substring.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1745 + ... + 2351.

It is an arithmetic number, because the mean of its divisors is an integer number (103740).

2^1243136 is an apocalyptic number.

1243136 is a gapful number since it is divisible by the number (16) 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 1243136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1244880).

1243136 is an abundant number, since it is smaller than the sum of its proper divisors (1246624).

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

1243136 is an frugal number, since it uses more digits than its factorization.

1243136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629 (or 609 counting only the distinct ones).

The product of its digits is 432, while the sum is 20.

The square root of 1243136 is about 1114.9600889718. The cubic root of 1243136 is about 107.5241986267.

Adding to 1243136 its reverse (6313421), we get a palindrome (7556557).

The spelling of 1243136 in words is "one million, two hundred forty-three thousand, one hundred thirty-six".