1408409 has 2 divisors, whose sum is σ = 1408410. Its totient is φ = 1408408.

The previous prime is 1408397. The next prime is 1408411. The reversal of 1408409 is 9048041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 760384 + 648025 = 872^2 + 805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1408409 is a prime.

It is a super-2 number, since 2×1408409² = 3967231822562, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1408411, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is equal to p₁₀₇₆₉₃ and since 1408409 and 107693 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1408499) 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 as a sum of consecutive naturals, namely, 704204 + 704205.

It is an arithmetic number, because the mean of its divisors is an integer number (704205).

2^1408409 is an apocalyptic number.

It is an amenable number.

1408409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1408409 is an equidigital number, since it uses as much as digits as its factorization.

1408409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1408409 is about 1186.7640877613. The cubic root of 1408409 is about 112.0924247711.

The spelling of 1408409 in words is "one million, four hundred eight thousand, four hundred nine".