1261787424 has 24 divisors (see below), whose sum is σ = 3312192240. Its totient is φ = 420595776.

The previous prime is 1261787323. The next prime is 1261787441. The reversal of 1261787424 is 4247871621.

It is a tau number, because it is divible by the number of its divisors (24).

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, 6571714 + ... + 6571905.

It is an arithmetic number, because the mean of its divisors is an integer number (138008010).

Almost surely, 2^1261787424 is an apocalyptic number.

It is an amenable number.

1261787424 is an abundant number, since it is smaller than the sum of its proper divisors (2050404816).

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

1261787424 is a wasteful number, since it uses less digits than its factorization.

1261787424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13143632 (or 13143624 counting only the distinct ones).

The product of its digits is 150528, while the sum is 42.

The square root of 1261787424 is about 35521.6472591010. The cubic root of 1261787424 is about 1080.5927884264.

The spelling of 1261787424 in words is "one billion, two hundred sixty-one million, seven hundred eighty-seven thousand, four hundred twenty-four".