1320861 has 8 divisors (see below), whose sum is σ = 1853920. Its totient is φ = 834192.

The previous prime is 1320859. The next prime is 1320871. The reversal of 1320861 is 1680231.

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

It is not a de Polignac number, because 1320861 - 2¹ = 1320859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11530 + ... + 11643.

It is an arithmetic number, because the mean of its divisors is an integer number (231740).

2^1320861 is an apocalyptic number.

It is an amenable number.

1320861 is a deficient number, since it is larger than the sum of its proper divisors (533059).

1320861 is a wasteful number, since it uses less digits than its factorization.

1320861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23195.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1320861 is about 1149.2871703800. The cubic root of 1320861 is about 109.7199764630.

The spelling of 1320861 in words is "one million, three hundred twenty thousand, eight hundred sixty-one".