1281406 has 8 divisors (see below), whose sum is σ = 2196720. Its totient is φ = 549168.

The previous prime is 1281389. The next prime is 1281407. The reversal of 1281406 is 6041821.

1281406 is nontrivially palindromic in base 6.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45751 + ... + 45778.

It is an arithmetic number, because the mean of its divisors is an integer number (274590).

2^1281406 is an apocalyptic number.

1281406 is a deficient number, since it is larger than the sum of its proper divisors (915314).

1281406 is an equidigital number, since it uses as much as digits as its factorization.

1281406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91538.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 1281406 is about 1131.9920494420. The cubic root of 1281406 is about 108.6164450246.

It can be divided in two parts, 12 and 81406, that added together give a palindrome (81418).

The spelling of 1281406 in words is "one million, two hundred eighty-one thousand, four hundred six".