1329891 has 8 divisors (see below), whose sum is σ = 1821264. Its totient is φ = 862560.

The previous prime is 1329871. The next prime is 1329899. The reversal of 1329891 is 1989231.

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

It is not a de Polignac number, because 1329891 - 2⁷ = 1329763 is a prime.

It is a super-2 number, since 2×1329891² = 3537220143762, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1329899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5880 + ... + 6101.

It is an arithmetic number, because the mean of its divisors is an integer number (227658).

2^1329891 is an apocalyptic number.

1329891 is a deficient number, since it is larger than the sum of its proper divisors (491373).

1329891 is a wasteful number, since it uses less digits than its factorization.

1329891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12021.

The product of its digits is 3888, while the sum is 33.

The square root of 1329891 is about 1153.2090010055. The cubic root of 1329891 is about 109.9694405468.

The spelling of 1329891 in words is "one million, three hundred twenty-nine thousand, eight hundred ninety-one".