1288815 has 32 divisors (see below), whose sum is σ = 2301696. Its totient is φ = 610560.

The previous prime is 1288799. The next prime is 1288817. The reversal of 1288815 is 5188821.

1288815 is a nontrivial binomial coefficient, being equal to C(1606, 2).

It is not a de Polignac number, because 1288815 - 2⁴ = 1288799 is a prime.

It is a super-2 number, since 2×1288815² = 3322088208450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an Ulam number.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11992 + ... + 12098.

It is an arithmetic number, because the mean of its divisors is an integer number (71928).

2^1288815 is an apocalyptic number.

1288815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1288815 is the 1605-th triangular number and also the 803-rd hexagonal number.

1288815 is a deficient number, since it is larger than the sum of its proper divisors (1012881).

1288815 is a wasteful number, since it uses less digits than its factorization.

1288815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199.

The product of its digits is 5120, while the sum is 33.

The square root of 1288815 is about 1135.2598821415. The cubic root of 1288815 is about 108.8253804237.

The spelling of 1288815 in words is "one million, two hundred eighty-eight thousand, eight hundred fifteen".