2256405 has 8 divisors (see below), whose sum is σ = 3610272. Its totient is φ = 1203408.

The previous prime is 2256389. The next prime is 2256413. The reversal of 2256405 is 5046522.

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

It is not a de Polignac number, because 2256405 - 2⁴ = 2256389 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75199 + ... + 75228.

It is an arithmetic number, because the mean of its divisors is an integer number (451284).

2^2256405 is an apocalyptic number.

It is an amenable number.

2256405 is a deficient number, since it is larger than the sum of its proper divisors (1353867).

2256405 is a wasteful number, since it uses less digits than its factorization.

2256405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150435.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 2256405 is about 1502.1334827505. The cubic root of 2256405 is about 131.1612915317.

The spelling of 2256405 in words is "two million, two hundred fifty-six thousand, four hundred five".