1281506 has 8 divisors (see below), whose sum is σ = 1934544. Its totient is φ = 636660.

The previous prime is 1281503. The next prime is 1281521. The reversal of 1281506 is 6051821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1281503) 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, 1640 + ... + 2291.

It is an arithmetic number, because the mean of its divisors is an integer number (241818).

2^1281506 is an apocalyptic number.

1281506 is a deficient number, since it is larger than the sum of its proper divisors (653038).

1281506 is a wasteful number, since it uses less digits than its factorization.

1281506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4096.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 1281506 is about 1132.0362185019. The cubic root of 1281506 is about 108.6192704008.

It can be divided in two parts, 12 and 81506, that added together give a palindrome (81518).

The spelling of 1281506 in words is "one million, two hundred eighty-one thousand, five hundred six".