4215240 has 80 divisors (see below), whose sum is σ = 14178780. Its totient is φ = 1123200.

The previous prime is 4215229. The next prime is 4215241. The reversal of 4215240 is 425124.

4215240 is a `hidden beast` number, since 421 + 5 + 240 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3437316 + 777924 = 1854^2 + 882^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (4215241) 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 19 ways as a sum of consecutive naturals, for example, 2590 + ... + 3890.

Almost surely, 2^4215240 is an apocalyptic number.

4215240 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 4215240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7089390).

4215240 is an abundant number, since it is smaller than the sum of its proper divisors (9963540).

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

4215240 is a wasteful number, since it uses less digits than its factorization.

4215240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324 (or 1311 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 4215240 is about 2053.1049656557. The cubic root of 4215240 is about 161.5377770772.

The spelling of 4215240 in words is "four million, two hundred fifteen thousand, two hundred forty".