1287758157 has 16 divisors (see below), whose sum is σ = 1991588352. Its totient is φ = 724878000.

The previous prime is 1287758149. The next prime is 1287758203. The reversal of 1287758157 is 7518577821.

It is a happy number.

It is not a de Polignac number, because 1287758157 - 2³ = 1287758149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287758557) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 456219 + ... + 459032.

It is an arithmetic number, because the mean of its divisors is an integer number (124474272).

Almost surely, 2^1287758157 is an apocalyptic number.

It is an amenable number.

1287758157 is a deficient number, since it is larger than the sum of its proper divisors (703830195).

1287758157 is an equidigital number, since it uses as much as digits as its factorization.

1287758157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915328.

The product of its digits is 1097600, while the sum is 51.

The square root of 1287758157 is about 35885.3473858064. The cubic root of 1287758157 is about 1087.9562627156.

The spelling of 1287758157 in words is "one billion, two hundred eighty-seven million, seven hundred fifty-eight thousand, one hundred fifty-seven".