5256421 has 8 divisors (see below), whose sum is σ = 5352984. Its totient is φ = 5160960.

The previous prime is 5256413. The next prime is 5256463. The reversal of 5256421 is 1246525.

It can be written as a sum of positive squares in 4 ways, for example, as 16900 + 5239521 = 130^2 + 2289^2 .

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 5256421 - 2³ = 5256413 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5256401) 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, 20325 + ... + 20581.

It is an arithmetic number, because the mean of its divisors is an integer number (669123).

Almost surely, 2^5256421 is an apocalyptic number.

It is an amenable number.

5256421 is a deficient number, since it is larger than the sum of its proper divisors (96563).

5256421 is a wasteful number, since it uses less digits than its factorization.

5256421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551.

The product of its digits is 2400, while the sum is 25.

The square root of 5256421 is about 2292.6885963863. The cubic root of 5256421 is about 173.8721591458.

The spelling of 5256421 in words is "five million, two hundred fifty-six thousand, four hundred twenty-one".