523218 has 32 divisors (see below), whose sum is σ = 1128960. Its totient is φ = 161280.

The previous prime is 523213. The next prime is 523219. The reversal of 523218 is 812325.

It is an Ulam number.

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

It is a nialpdrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 523194 and 523203.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 523218.

It is not an unprimeable number, because it can be changed into a prime (523213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5346 + ... + 5442.

It is an arithmetic number, because the mean of its divisors is an integer number (35280).

2⁵²³²¹⁸ is an apocalyptic number.

523218 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

523218 is an abundant number, since it is smaller than the sum of its proper divisors (605742).

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

523218 is a wasteful number, since it uses less digits than its factorization.

523218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162.

The product of its digits is 480, while the sum is 21.

The square root of 523218 is about 723.3380952224. The cubic root of 523218 is about 80.5800548727.

It can be divided in two parts, 523 and 218, that added together give a triangular number (741 = T₃₈).

The spelling of 523218 in words is "five hundred twenty-three thousand, two hundred eighteen".