521456 has 40 divisors (see below), whose sum is σ = 1145760. Its totient is φ = 228096.

The previous prime is 521447. The next prime is 521471. The reversal of 521456 is 654125.

521456 is nontrivially palindromic in base 5.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

521456 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4730 + ... + 4838.

It is an arithmetic number, because the mean of its divisors is an integer number (28644).

2⁵²¹⁴⁵⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (572880).

521456 is an abundant number, since it is smaller than the sum of its proper divisors (624304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521456 is a wasteful number, since it uses less digits than its factorization.

521456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153 (or 147 counting only the distinct ones).

The product of its digits is 1200, while the sum is 23.

The square root of 521456 is about 722.1191037495. The cubic root of 521456 is about 80.4894987781.

The spelling of 521456 in words is "five hundred twenty-one thousand, four hundred fifty-six".