1261287382 has 8 divisors (see below), whose sum is σ = 1892181816. Its totient is φ = 630560112.

The previous prime is 1261287353. The next prime is 1261287437. The reversal of 1261287382 is 2837821621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20823 + ... + 54370.

It is an arithmetic number, because the mean of its divisors is an integer number (236522727).

Almost surely, 2^1261287382 is an apocalyptic number.

1261287382 is a deficient number, since it is larger than the sum of its proper divisors (630894434).

1261287382 is an equidigital number, since it uses as much as digits as its factorization.

1261287382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83582.

The product of its digits is 64512, while the sum is 40.

The square root of 1261287382 is about 35514.6080085364. The cubic root of 1261287382 is about 1080.4500245020.

The spelling of 1261287382 in words is "one billion, two hundred sixty-one million, two hundred eighty-seven thousand, three hundred eighty-two".