1287168842 has 8 divisors (see below), whose sum is σ = 1977844932. Its totient is φ = 627887200.

The previous prime is 1287168809. The next prime is 1287168881. The reversal of 1287168842 is 2488617821.

It can be written as a sum of positive squares in 2 ways, for example, as 1182740881 + 104427961 = 34391^2 + 10219^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7848509 + ... + 7848672.

Almost surely, 2^1287168842 is an apocalyptic number.

1287168842 is a deficient number, since it is larger than the sum of its proper divisors (690676090).

1287168842 is a wasteful number, since it uses less digits than its factorization.

1287168842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15697224.

The product of its digits is 344064, while the sum is 47.

The square root of 1287168842 is about 35877.1353650204. The cubic root of 1287168842 is about 1087.7902774155.

The spelling of 1287168842 in words is "one billion, two hundred eighty-seven million, one hundred sixty-eight thousand, eight hundred forty-two".