1399409 has 4 divisors (see below), whose sum is σ = 1526640. Its totient is φ = 1272180.

The previous prime is 1399403. The next prime is 1399417. The reversal of 1399409 is 9049931.

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: 9049931 = 11 ⋅822721.

It is a cyclic number.

It is not a de Polignac number, because 1399409 - 2⁴ = 1399393 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1399403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63599 + ... + 63620.

It is an arithmetic number, because the mean of its divisors is an integer number (381660).

2^1399409 is an apocalyptic number.

It is an amenable number.

1399409 is a deficient number, since it is larger than the sum of its proper divisors (127231).

1399409 is a wasteful number, since it uses less digits than its factorization.

1399409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127230.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 1399409 is about 1182.9661871753. The cubic root of 1399409 is about 111.8531504410.

The spelling of 1399409 in words is "one million, three hundred ninety-nine thousand, four hundred nine".