1288521 has 16 divisors (see below), whose sum is σ = 2056320. Its totient is φ = 792720.

The previous prime is 1288519. The next prime is 1288531. The reversal of 1288521 is 1258821.

It is not a de Polignac number, because 1288521 - 2¹ = 1288519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1288531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1485 + ... + 2186.

It is an arithmetic number, because the mean of its divisors is an integer number (128520).

2^1288521 is an apocalyptic number.

It is an amenable number.

1288521 is a deficient number, since it is larger than the sum of its proper divisors (767799).

1288521 is a wasteful number, since it uses less digits than its factorization.

1288521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3693 (or 3687 counting only the distinct ones).

The product of its digits is 1280, while the sum is 27.

The square root of 1288521 is about 1135.1303889862. The cubic root of 1288521 is about 108.8171048385.

It can be divided in two parts, 128 and 8521, that added together give a square (8649 = 93²).

The spelling of 1288521 in words is "one million, two hundred eighty-eight thousand, five hundred twenty-one".