1261980724 has 12 divisors (see below), whose sum is σ = 2212860384. Its totient is φ = 629734904.

The previous prime is 1261980701. The next prime is 1261980743. The reversal of 1261980724 is 4270891621.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 311602 + ... + 315625.

It is an arithmetic number, because the mean of its divisors is an integer number (184405032).

Almost surely, 2^1261980724 is an apocalyptic number.

It is an amenable number.

1261980724 is a deficient number, since it is larger than the sum of its proper divisors (950879660).

1261980724 is a wasteful number, since it uses less digits than its factorization.

1261980724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627734 (or 627732 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 1261980724 is about 35524.3680309728. The cubic root of 1261980724 is about 1080.6479662154.

The spelling of 1261980724 in words is "one billion, two hundred sixty-one million, nine hundred eighty thousand, seven hundred twenty-four".