1243881 has 6 divisors (see below), whose sum is σ = 1796730. Its totient is φ = 829248.

The previous prime is 1243877. The next prime is 1243883. The reversal of 1243881 is 1883421.

It can be written as a sum of positive squares in only one way, i.e., 968256 + 275625 = 984^2 + 525^2 .

It is not a de Polignac number, because 1243881 - 2² = 1243877 is a prime.

It is a super-2 number, since 2×1243881² = 3094479884322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1243883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69096 + ... + 69113.

It is an arithmetic number, because the mean of its divisors is an integer number (299455).

2^1243881 is an apocalyptic number.

It is an amenable number.

1243881 is a deficient number, since it is larger than the sum of its proper divisors (552849).

1243881 is a wasteful number, since it uses less digits than its factorization.

1243881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138215 (or 138212 counting only the distinct ones).

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

The square root of 1243881 is about 1115.2941316083. The cubic root of 1243881 is about 107.5456737592.

It can be divided in two parts, 124 and 3881, that added together give a triangular number (4005 = T₈₉).

The spelling of 1243881 in words is "one million, two hundred forty-three thousand, eight hundred eighty-one".