1406809 has 4 divisors (see below), whose sum is σ = 1417680. Its totient is φ = 1395940.

The previous prime is 1406807. The next prime is 1406827. The reversal of 1406809 is 9086041.

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: 9086041 = 17 ⋅534473.

It is a cyclic number.

It is not a de Polignac number, because 1406809 - 2¹ = 1406807 is a prime.

It is a super-2 number, since 2×1406809² = 3958223124962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1406803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5239 + ... + 5500.

It is an arithmetic number, because the mean of its divisors is an integer number (354420).

2^1406809 is an apocalyptic number.

It is an amenable number.

1406809 is a deficient number, since it is larger than the sum of its proper divisors (10871).

1406809 is a wasteful number, since it uses less digits than its factorization.

1406809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10870.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1406809 is about 1186.0897942399. The cubic root of 1406809 is about 112.0499617655.

The spelling of 1406809 in words is "one million, four hundred six thousand, eight hundred nine".