1288861 has 8 divisors (see below), whose sum is σ = 1488384. Its totient is φ = 1093200.

The previous prime is 1288853. The next prime is 1288871. The reversal of 1288861 is 1688821.

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 1288861 - 2³ = 1288853 is a prime.

It is a super-2 number, since 2×1288861² = 3322325354642, 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 (1288831) 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, 205 + ... + 1618.

It is an arithmetic number, because the mean of its divisors is an integer number (186048).

2^1288861 is an apocalyptic number.

It is an amenable number.

1288861 is a deficient number, since it is larger than the sum of its proper divisors (199523).

1288861 is a wasteful number, since it uses less digits than its factorization.

1288861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1931.

The product of its digits is 6144, while the sum is 34.

The square root of 1288861 is about 1135.2801416391. The cubic root of 1288861 is about 108.8266751293.

The spelling of 1288861 in words is "one million, two hundred eighty-eight thousand, eight hundred sixty-one".