521418 has 24 divisors (see below), whose sum is σ = 1090368. Its totient is φ = 166152.

The previous prime is 521401. The next prime is 521429. The reversal of 521418 is 814125.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 521394 and 521403.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11071 + ... + 11117.

It is an arithmetic number, because the mean of its divisors is an integer number (45432).

2⁵²¹⁴¹⁸ is an apocalyptic number.

521418 is an abundant number, since it is smaller than the sum of its proper divisors (568950).

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

521418 is a wasteful number, since it uses less digits than its factorization.

521418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 95 counting only the distinct ones).

The product of its digits is 320, while the sum is 21.

The square root of 521418 is about 722.0927918211. The cubic root of 521418 is about 80.4875435634.

It can be divided in two parts, 521 and 418, that added together give a palindrome (939).

The spelling of 521418 in words is "five hundred twenty-one thousand, four hundred eighteen".