1261247412 has 96 divisors (see below), whose sum is σ = 3166055424. Its totient is φ = 389804800.

The previous prime is 1261247399. The next prime is 1261247419. The reversal of 1261247412 is 2147421621.

1261247412 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 1261247412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261247419) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2568487 + ... + 2568977.

It is an arithmetic number, because the mean of its divisors is an integer number (32979744).

Almost surely, 2^1261247412 is an apocalyptic number.

1261247412 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 1261247412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1583027712).

1261247412 is an abundant number, since it is smaller than the sum of its proper divisors (1904808012).

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

1261247412 is a wasteful number, since it uses less digits than its factorization.

1261247412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789 (or 787 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 1261247412 is about 35514.0452778897. The cubic root of 1261247412 is about 1080.4386112840.

The spelling of 1261247412 in words is "one billion, two hundred sixty-one million, two hundred forty-seven thousand, four hundred twelve".