1329409 has 3 divisors (see below), whose sum is σ = 1330563. Its totient is φ = 1328256.

The previous prime is 1329407. The next prime is 1329437. The reversal of 1329409 is 9049231.

It is a happy number.

The square root of 1329409 is 1153.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1050625 + 278784 = 1025^2 + 528^2 .

It is not a de Polignac number, because 1329409 - 2¹ = 1329407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1329407) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 577 + ... + 1729.

It is an arithmetic number, because the mean of its divisors is an integer number (443521).

2^1329409 is an apocalyptic number.

1329409 is the 1153-rd square number.

1329409 is the 577-th centered octagonal number.

It is an amenable number.

1329409 is a deficient number, since it is larger than the sum of its proper divisors (1154).

1329409 is an frugal number, since it uses more digits than its factorization.

1329409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2306 (or 1153 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The cubic root of 1329409 is about 109.9561533237.

The spelling of 1329409 in words is "one million, three hundred twenty-nine thousand, four hundred nine".