1329813 has 12 divisors (see below), whose sum is σ = 1936480. Its totient is φ = 879336.

The previous prime is 1329799. The next prime is 1329847. The reversal of 1329813 is 3189231.

It is not a de Polignac number, because 1329813 - 2¹⁸ = 1067669 is a prime.

It is a super-2 number, since 2×1329813² = 3536805229938, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1329863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 720 + ... + 1782.

2^1329813 is an apocalyptic number.

It is an amenable number.

1329813 is a deficient number, since it is larger than the sum of its proper divisors (606667).

1329813 is a wasteful number, since it uses less digits than its factorization.

1329813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208 (or 1205 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 1329813 is about 1153.1751818349. The cubic root of 1329813 is about 109.9672905500.

The spelling of 1329813 in words is "one million, three hundred twenty-nine thousand, eight hundred thirteen".