1329641 has 4 divisors (see below), whose sum is σ = 1333632. Its totient is φ = 1325652.

The previous prime is 1329637. The next prime is 1329661. The reversal of 1329641 is 1469231.

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 a cyclic number.

It is not a de Polignac number, because 1329641 - 2² = 1329637 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1329641.

It is not an unprimeable number, because it can be changed into a prime (1329631) 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, 1445 + ... + 2178.

It is an arithmetic number, because the mean of its divisors is an integer number (333408).

2^1329641 is an apocalyptic number.

It is an amenable number.

1329641 is a deficient number, since it is larger than the sum of its proper divisors (3991).

1329641 is an equidigital number, since it uses as much as digits as its factorization.

1329641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3990.

The product of its digits is 1296, while the sum is 26.

The square root of 1329641 is about 1153.1006027229. The cubic root of 1329641 is about 109.9625492344.

The spelling of 1329641 in words is "one million, three hundred twenty-nine thousand, six hundred forty-one".