1281039 has 4 divisors (see below), whose sum is σ = 1708056. Its totient is φ = 854024.

The previous prime is 1281029. The next prime is 1281041. The reversal of 1281039 is 9301821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1281039 - 2¹³ = 1272847 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 (1281029) 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, 213504 + ... + 213509.

It is an arithmetic number, because the mean of its divisors is an integer number (427014).

2^1281039 is an apocalyptic number.

1281039 is a deficient number, since it is larger than the sum of its proper divisors (427017).

1281039 is an equidigital number, since it uses as much as digits as its factorization.

1281039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427016.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1281039 is about 1131.8299342216. The cubic root of 1281039 is about 108.6060746342.

The spelling of 1281039 in words is "one million, two hundred eighty-one thousand, thirty-nine".