1206865 has 8 divisors (see below), whose sum is σ = 1579968. Its totient is φ = 877680.

The previous prime is 1206841. The next prime is 1206869. The reversal of 1206865 is 5686021.

1206865 = 175² + 176² + ... + 207².

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

It is not a de Polignac number, because 1206865 - 2⁹ = 1206353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1206869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10917 + ... + 11026.

It is an arithmetic number, because the mean of its divisors is an integer number (197496).

2^1206865 is an apocalyptic number.

It is an amenable number.

1206865 is a deficient number, since it is larger than the sum of its proper divisors (373103).

1206865 is a wasteful number, since it uses less digits than its factorization.

1206865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21959.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1206865 is about 1098.5740757910. The cubic root of 1206865 is about 106.4681147981.

The spelling of 1206865 in words is "one million, two hundred six thousand, eight hundred sixty-five".