1309855 has 4 divisors (see below), whose sum is σ = 1571832. Its totient is φ = 1047880.

The previous prime is 1309849. The next prime is 1309877. The reversal of 1309855 is 5589031.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-1309855 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130981 + ... + 130990.

It is an arithmetic number, because the mean of its divisors is an integer number (392958).

2^1309855 is an apocalyptic number.

1309855 is a deficient number, since it is larger than the sum of its proper divisors (261977).

1309855 is an equidigital number, since it uses as much as digits as its factorization.

1309855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261976.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1309855 is about 1144.4889689289. The cubic root of 1309855 is about 109.4143809211.

The spelling of 1309855 in words is "one million, three hundred nine thousand, eight hundred fifty-five".