1287029939 has 4 divisors (see below), whose sum is σ = 1386032256. Its totient is φ = 1188027624.

The previous prime is 1287029873. The next prime is 1287029963. The reversal of 1287029939 is 9399207821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1287029939 - 2⁸ = 1287029683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287029539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49501139 + ... + 49501164.

It is an arithmetic number, because the mean of its divisors is an integer number (346508064).

Almost surely, 2^1287029939 is an apocalyptic number.

1287029939 is a deficient number, since it is larger than the sum of its proper divisors (99002317).

1287029939 is an equidigital number, since it uses as much as digits as its factorization.

1287029939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99002316.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 1287029939 is about 35875.1994977031. The cubic root of 1287029939 is about 1087.7511468929.

The spelling of 1287029939 in words is "one billion, two hundred eighty-seven million, twenty-nine thousand, nine hundred thirty-nine".