1296855 has 48 divisors (see below), whose sum is σ = 2695680. Its totient is φ = 563904.

The previous prime is 1296839. The next prime is 1296877. The reversal of 1296855 is 5586921.

It is a happy number.

1296855 is a nontrivial binomial coefficient, being equal to C(1611, 2).

It is not a de Polignac number, because 1296855 - 2⁴ = 1296839 is a prime.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 7156 + ... + 7334.

It is an arithmetic number, because the mean of its divisors is an integer number (56160).

2^1296855 is an apocalyptic number.

1296855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1296855 is the 1610-th triangular number.

1296855 is an abundant number, since it is smaller than the sum of its proper divisors (1398825).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1296855 is a wasteful number, since it uses less digits than its factorization.

1296855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 217 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 1296855 is about 1138.7954162184. The cubic root of 1296855 is about 109.0512061961.

The spelling of 1296855 in words is "one million, two hundred ninety-six thousand, eight hundred fifty-five".