1287953885 has 16 divisors (see below), whose sum is σ = 1615718016. Its totient is φ = 983746368.

The previous prime is 1287953861. The next prime is 1287953923. The reversal of 1287953885 is 5883597821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1287953885 - 2⁸ = 1287953629 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 1287953885.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 54002 + ... + 74108.

It is an arithmetic number, because the mean of its divisors is an integer number (100982376).

Almost surely, 2^1287953885 is an apocalyptic number.

It is an amenable number.

1287953885 is a deficient number, since it is larger than the sum of its proper divisors (327764131).

1287953885 is a wasteful number, since it uses less digits than its factorization.

1287953885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20692.

The product of its digits is 4838400, while the sum is 56.

The square root of 1287953885 is about 35888.0744119826. The cubic root of 1287953885 is about 1088.0113798753.

The spelling of 1287953885 in words is "one billion, two hundred eighty-seven million, nine hundred fifty-three thousand, eight hundred eighty-five".