1282987257 has 8 divisors (see below), whose sum is σ = 1713065280. Its totient is φ = 854117040.

The previous prime is 1282987241. The next prime is 1282987309. The reversal of 1282987257 is 7527892821.

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

It is not a de Polignac number, because 1282987257 - 2⁴ = 1282987241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1282987207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 299469 + ... + 303722.

It is an arithmetic number, because the mean of its divisors is an integer number (214133160).

Almost surely, 2^1282987257 is an apocalyptic number.

It is an amenable number.

1282987257 is a deficient number, since it is larger than the sum of its proper divisors (430078023).

1282987257 is an equidigital number, since it uses as much as digits as its factorization.

1282987257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603903.

The product of its digits is 1128960, while the sum is 51.

The square root of 1282987257 is about 35818.8114961957. The cubic root of 1282987257 is about 1086.6110428054.

The spelling of 1282987257 in words is "one billion, two hundred eighty-two million, nine hundred eighty-seven thousand, two hundred fifty-seven".