1328961 has 4 divisors (see below), whose sum is σ = 1771952. Its totient is φ = 885972.

The previous prime is 1328953. The next prime is 1328969. The reversal of 1328961 is 1698231.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1698231 = 3 ⋅566077.

It is an interprime number because it is at equal distance from previous prime (1328953) and next prime (1328969).

It is not a de Polignac number, because 1328961 - 2³ = 1328953 is a prime.

It is a super-2 number, since 2×1328961² = 3532274679042, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1328969) 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, 221491 + ... + 221496.

It is an arithmetic number, because the mean of its divisors is an integer number (442988).

2^1328961 is an apocalyptic number.

It is an amenable number.

1328961 is a deficient number, since it is larger than the sum of its proper divisors (442991).

1328961 is an equidigital number, since it uses as much as digits as its factorization.

1328961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442990.

The product of its digits is 2592, while the sum is 30.

The square root of 1328961 is about 1152.8057078276. The cubic root of 1328961 is about 109.9438004934.

The spelling of 1328961 in words is "one million, three hundred twenty-eight thousand, nine hundred sixty-one".