1243632126 has 64 divisors (see below), whose sum is σ = 2891759616. Its totient is φ = 352783200.

The previous prime is 1243632119. The next prime is 1243632139. The reversal of 1243632126 is 6212363421.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1243632093 and 1243632102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62631 + ... + 80061.

It is an arithmetic number, because the mean of its divisors is an integer number (45183744).

Almost surely, 2^1243632126 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1243632126, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1445879808).

1243632126 is an abundant number, since it is smaller than the sum of its proper divisors (1648127490).

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

1243632126 is a wasteful number, since it uses less digits than its factorization.

1243632126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17517.

The product of its digits is 10368, while the sum is 30.

The square root of 1243632126 is about 35265.1687363041. The cubic root of 1243632126 is about 1075.3850075064.

Adding to 1243632126 its reverse (6212363421), we get a palindrome (7455995547).

The spelling of 1243632126 in words is "one billion, two hundred forty-three million, six hundred thirty-two thousand, one hundred twenty-six".