1281237 has 4 divisors (see below), whose sum is σ = 1708320. Its totient is φ = 854156.

The previous prime is 1281229. The next prime is 1281253. The reversal of 1281237 is 7321821.

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 not a de Polignac number, because 1281237 - 2³ = 1281229 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213537 + ... + 213542.

It is an arithmetic number, because the mean of its divisors is an integer number (427080).

2^1281237 is an apocalyptic number.

It is an amenable number.

1281237 is a deficient number, since it is larger than the sum of its proper divisors (427083).

1281237 is an equidigital number, since it uses as much as digits as its factorization.

1281237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427082.

The product of its digits is 672, while the sum is 24.

The square root of 1281237 is about 1131.9173998133. The cubic root of 1281237 is about 108.6116698047.

The spelling of 1281237 in words is "one million, two hundred eighty-one thousand, two hundred thirty-seven".