1281215 has 16 divisors (see below), whose sum is σ = 1729728. Its totient is φ = 903936.

The previous prime is 1281211. The next prime is 1281221. The reversal of 1281215 is 5121821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1281215 - 2² = 1281211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281211) 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 15 ways as a sum of consecutive naturals, for example, 1067 + ... + 1923.

It is an arithmetic number, because the mean of its divisors is an integer number (108108).

2^1281215 is an apocalyptic number.

1281215 is a deficient number, since it is larger than the sum of its proper divisors (448513).

1281215 is a wasteful number, since it uses less digits than its factorization.

1281215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898.

The product of its digits is 160, while the sum is 20.

The square root of 1281215 is about 1131.9076817479. The cubic root of 1281215 is about 108.6110481476.

Subtracting 1281215 from its reverse (5121821), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 1281215 in words is "one million, two hundred eighty-one thousand, two hundred fifteen".