1261334240 has 48 divisors (see below), whose sum is σ = 2996617680. Its totient is φ = 501703680.

The previous prime is 1261334213. The next prime is 1261334251. The reversal of 1261334240 is 424331621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6620 + ... + 50660.

It is an arithmetic number, because the mean of its divisors is an integer number (62429535).

Almost surely, 2^1261334240 is an apocalyptic number.

1261334240 is a gapful number since it is divisible by the number (10) 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 1261334240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1498308840).

1261334240 is an abundant number, since it is smaller than the sum of its proper divisors (1735283440).

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

1261334240 is a wasteful number, since it uses less digits than its factorization.

1261334240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44235 (or 44227 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 1261334240 is about 35515.2677027782. The cubic root of 1261334240 is about 1080.4634042443.

Adding to 1261334240 its reverse (424331621), we get a palindrome (1685665861).

The spelling of 1261334240 in words is "one billion, two hundred sixty-one million, three hundred thirty-four thousand, two hundred forty".