1426409 has 4 divisors (see below), whose sum is σ = 1428804. Its totient is φ = 1424016.

The previous prime is 1426393. The next prime is 1426427. The reversal of 1426409 is 9046241.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9046241 = 37 ⋅244493.

It can be written as a sum of positive squares in 2 ways, for example, as 426409 + 1000000 = 653^2 + 1000^2 .

It is a cyclic number.

It is not a de Polignac number, because 1426409 - 2⁴ = 1426393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1426429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 479 + ... + 1755.

It is an arithmetic number, because the mean of its divisors is an integer number (357201).

2^1426409 is an apocalyptic number.

It is an amenable number.

1426409 is a deficient number, since it is larger than the sum of its proper divisors (2395).

1426409 is a wasteful number, since it uses less digits than its factorization.

1426409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2394.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1426409 is about 1194.3236579755. The cubic root of 1426409 is about 112.5679326335.

The spelling of 1426409 in words is "one million, four hundred twenty-six thousand, four hundred nine".