2256409 has 8 divisors (see below), whose sum is σ = 2309120. Its totient is φ = 2204496.

The previous prime is 2256389. The next prime is 2256413. The reversal of 2256409 is 9046522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 5-Lehmer number, since φ(2256409) divides (2256409-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 2256409 - 2⁵ = 2256377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2256469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13762 + ... + 13924.

It is an arithmetic number, because the mean of its divisors is an integer number (288640).

2^2256409 is an apocalyptic number.

It is an amenable number.

2256409 is a deficient number, since it is larger than the sum of its proper divisors (52711).

2256409 is a wasteful number, since it uses less digits than its factorization.

2256409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 2256409 is about 1502.1348141895. The cubic root of 2256409 is about 131.1613690362.

The spelling of 2256409 in words is "two million, two hundred fifty-six thousand, four hundred nine".