4256405 has 8 divisors (see below), whose sum is σ = 5148672. Its totient is φ = 3377808.

The previous prime is 4256389. The next prime is 4256407. The reversal of 4256405 is 5046524.

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

It is a cyclic number.

It is not a de Polignac number, because 4256405 - 2⁴ = 4256389 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4256407) 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, 2717 + ... + 3986.

It is an arithmetic number, because the mean of its divisors is an integer number (643584).

Almost surely, 2^4256405 is an apocalyptic number.

It is an amenable number.

4256405 is a deficient number, since it is larger than the sum of its proper divisors (892267).

4256405 is a wasteful number, since it uses less digits than its factorization.

4256405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6835.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 4256405 is about 2063.1056686462. The cubic root of 4256405 is about 162.0619206467.

The spelling of 4256405 in words is "four million, two hundred fifty-six thousand, four hundred five".