1288856917 has 8 divisors (see below), whose sum is σ = 1294324416. Its totient is φ = 1283398272.

The previous prime is 1288856903. The next prime is 1288856929. The reversal of 1288856917 is 7196588821.

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

It is a cyclic number.

It is not a de Polignac number, because 1288856917 - 2¹⁵ = 1288824149 is a prime.

It is a super-2 number, since 2×1288856917² = 3322304304997489778, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288856117) 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, 565893 + ... + 568165.

It is an arithmetic number, because the mean of its divisors is an integer number (161790552).

Almost surely, 2^1288856917 is an apocalyptic number.

It is an amenable number.

1288856917 is a deficient number, since it is larger than the sum of its proper divisors (5467499).

1288856917 is a wasteful number, since it uses less digits than its factorization.

1288856917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4427.

The product of its digits is 1935360, while the sum is 55.

The square root of 1288856917 is about 35900.6534341647. The cubic root of 1288856917 is about 1088.2656021133.

The spelling of 1288856917 in words is "one billion, two hundred eighty-eight million, eight hundred fifty-six thousand, nine hundred seventeen".