1288816 has 20 divisors (see below), whose sum is σ = 2523400. Its totient is φ = 637632.

The previous prime is 1288799. The next prime is 1288817. The reversal of 1288816 is 6188821.

It is a super-2 number, since 2×1288816² = 3322093363712, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 1288816 parts by 1605 straight cuts.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288817) 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, 1375 + ... + 2113.

It is an arithmetic number, because the mean of its divisors is an integer number (126170).

2^1288816 is an apocalyptic number.

1288816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1288816 is a deficient number, since it is larger than the sum of its proper divisors (1234584).

1288816 is a wasteful number, since it uses less digits than its factorization.

1288816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856 (or 850 counting only the distinct ones).

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

The square root of 1288816 is about 1135.2603225692. The cubic root of 1288816 is about 108.8254085698.

The spelling of 1288816 in words is "one million, two hundred eighty-eight thousand, eight hundred sixteen".