1261424444 has 36 divisors (see below), whose sum is σ = 2586429720. Its totient is φ = 536709600.

The previous prime is 1261424419. The next prime is 1261424447. The reversal of 1261424444 is 4444241621.

It is a self number, because there is not a number n which added to its sum of digits gives 1261424444.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261424447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4094 + ... + 50394.

It is an arithmetic number, because the mean of its divisors is an integer number (71845270).

Almost surely, 2^1261424444 is an apocalyptic number.

1261424444 is a gapful number since it is divisible by the number (14) 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 1261424444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1293214860).

1261424444 is an abundant number, since it is smaller than the sum of its proper divisors (1325005276).

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

1261424444 is a wasteful number, since it uses less digits than its factorization.

1261424444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46458 (or 46449 counting only the distinct ones).

The product of its digits is 24576, while the sum is 32.

The square root of 1261424444 is about 35516.5376127798. The cubic root of 1261424444 is about 1080.4891599862.

The spelling of 1261424444 in words is "one billion, two hundred sixty-one million, four hundred twenty-four thousand, four hundred forty-four".