1243872 has 72 divisors (see below), whose sum is σ = 4049136. Its totient is φ = 354816.

The previous prime is 1243859. The next prime is 1243877. The reversal of 1243872 is 2783421.

It is a tau number, because it is divible by the number of its divisors (72).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1708 + ... + 2324.

It is an arithmetic number, because the mean of its divisors is an integer number (56238).

2^1243872 is an apocalyptic number.

1243872 is a gapful number since it is divisible by the number (12) 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 1243872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2024568).

1243872 is an abundant number, since it is smaller than the sum of its proper divisors (2805264).

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

1243872 is a wasteful number, since it uses less digits than its factorization.

1243872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640 (or 629 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 1243872 is about 1115.2900967910. The cubic root of 1243872 is about 107.5454143793.

The spelling of 1243872 in words is "one million, two hundred forty-three thousand, eight hundred seventy-two".