1281530724 has 12 divisors (see below), whose sum is σ = 2990238384. Its totient is φ = 427176904.

The previous prime is 1281530699. The next prime is 1281530741. The reversal of 1281530724 is 4270351821.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53397102 + ... + 53397125.

It is an arithmetic number, because the mean of its divisors is an integer number (249186532).

Almost surely, 2^1281530724 is an apocalyptic number.

It is an amenable number.

1281530724 is an abundant number, since it is smaller than the sum of its proper divisors (1708707660).

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

1281530724 is a wasteful number, since it uses less digits than its factorization.

1281530724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106794234 (or 106794232 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 1281530724 is about 35798.4737663493. The cubic root of 1281530724 is about 1086.1996892411.

The spelling of 1281530724 in words is "one billion, two hundred eighty-one million, five hundred thirty thousand, seven hundred twenty-four".