1320681 has 4 divisors (see below), whose sum is σ = 1760912. Its totient is φ = 880452.

The previous prime is 1320667. The next prime is 1320721. The reversal of 1320681 is 1860231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1320681 - 2⁶ = 1320617 is a prime.

It is a super-2 number, since 2×1320681² = 3488396607522, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1320181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220111 + ... + 220116.

It is an arithmetic number, because the mean of its divisors is an integer number (440228).

2^1320681 is an apocalyptic number.

It is an amenable number.

1320681 is a deficient number, since it is larger than the sum of its proper divisors (440231).

1320681 is an equidigital number, since it uses as much as digits as its factorization.

1320681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440230.

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

The square root of 1320681 is about 1149.2088583021. The cubic root of 1320681 is about 109.7149922159.

The spelling of 1320681 in words is "one million, three hundred twenty thousand, six hundred eighty-one".