1287842983 has 8 divisors (see below), whose sum is σ = 1472087552. Its totient is φ = 1103665176.

The previous prime is 1287842953. The next prime is 1287842999. The reversal of 1287842983 is 3892487821.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1287842983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1287842983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287842953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35566 + ... + 61972.

It is an arithmetic number, because the mean of its divisors is an integer number (184010944).

Almost surely, 2^1287842983 is an apocalyptic number.

1287842983 is a deficient number, since it is larger than the sum of its proper divisors (184244569).

1287842983 is an equidigital number, since it uses as much as digits as its factorization.

1287842983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33381.

The product of its digits is 1548288, while the sum is 52.

The square root of 1287842983 is about 35886.5292693512. The cubic root of 1287842983 is about 1087.9801504700.

The spelling of 1287842983 in words is "one billion, two hundred eighty-seven million, eight hundred forty-two thousand, nine hundred eighty-three".