1287253 has 4 divisors (see below), whose sum is σ = 1404288. Its totient is φ = 1170220.

The previous prime is 1287239. The next prime is 1287289. The reversal of 1287253 is 3527821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1287253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287233) 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, 58501 + ... + 58522.

It is an arithmetic number, because the mean of its divisors is an integer number (351072).

2^1287253 is an apocalyptic number.

It is an amenable number.

1287253 is a deficient number, since it is larger than the sum of its proper divisors (117035).

1287253 is a wasteful number, since it uses less digits than its factorization.

1287253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117034.

The product of its digits is 3360, while the sum is 28.

The square root of 1287253 is about 1134.5717253660. The cubic root of 1287253 is about 108.7813984292.

It can be divided in two parts, 1287 and 253, that added together give a triangular number (1540 = T₅₅).

The spelling of 1287253 in words is "one million, two hundred eighty-seven thousand, two hundred fifty-three".