2256421 has 8 divisors (see below), whose sum is σ = 2400320. Its totient is φ = 2115072.

The previous prime is 2256413. The next prime is 2256431. The reversal of 2256421 is 1246522.

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 2256421 - 2³ = 2256413 is a prime.

It is a Duffinian number.

2256421 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2256392 and 2256401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2256431) 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, 1381 + ... + 2533.

It is an arithmetic number, because the mean of its divisors is an integer number (300040).

2^2256421 is an apocalyptic number.

It is an amenable number.

2256421 is a deficient number, since it is larger than the sum of its proper divisors (143899).

2256421 is a wasteful number, since it uses less digits than its factorization.

2256421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275.

The product of its digits is 960, while the sum is 22.

The square root of 2256421 is about 1502.1388084994. The cubic root of 2256421 is about 131.1616015493.

The spelling of 2256421 in words is "two million, two hundred fifty-six thousand, four hundred twenty-one".