4218240 has 128 divisors (see below), whose sum is σ = 14565600. Its totient is φ = 1038336.

The previous prime is 4218199. The next prime is 4218241. The reversal of 4218240 is 428124.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4218241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324474 + ... + 324486.

Almost surely, 2^4218240 is an apocalyptic number.

4218240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4218240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7282800).

4218240 is an abundant number, since it is smaller than the sum of its proper divisors (10347360).

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

4218240 is an equidigital number, since it uses as much as digits as its factorization.

4218240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61 (or 23 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 4218240 is about 2053.8354364457. The cubic root of 4218240 is about 161.5760903096.

The spelling of 4218240 in words is "four million, two hundred eighteen thousand, two hundred forty".