1287974857 has 12 divisors (see below), whose sum is σ = 1396445184. Its totient is φ = 1187387760.

The previous prime is 1287974813. The next prime is 1287974873. The reversal of 1287974857 is 7584797821.

It is not a de Polignac number, because 1287974857 - 2¹¹ = 1287972809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287974057) 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 11 ways as a sum of consecutive naturals, for example, 141432 + ... + 150262.

It is an arithmetic number, because the mean of its divisors is an integer number (116370432).

Almost surely, 2^1287974857 is an apocalyptic number.

It is an amenable number.

1287974857 is a deficient number, since it is larger than the sum of its proper divisors (108470327).

1287974857 is an equidigital number, since it uses as much as digits as its factorization.

1287974857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9720 (or 9707 counting only the distinct ones).

The product of its digits is 7902720, while the sum is 58.

The square root of 1287974857 is about 35888.3665969907. The cubic root of 1287974857 is about 1088.0172852759.

It can be divided in two parts, 1287 and 974857, that added together give a square (976144 = 988²).

The spelling of 1287974857 in words is "one billion, two hundred eighty-seven million, nine hundred seventy-four thousand, eight hundred fifty-seven".