4018520 has 32 divisors (see below), whose sum is σ = 9864720. Its totient is φ = 1461120.

The previous prime is 4018507. The next prime is 4018523. The reversal of 4018520 is 258104.

Added to its reverse (258104) it gives a square (4276624 = 2068²).

4018520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×4018520² = 32297005980800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 4018492 and 4018501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4018523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4127 + ... + 5006.

Almost surely, 2^4018520 is an apocalyptic number.

4018520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4018520 is an abundant number, since it is smaller than the sum of its proper divisors (5846200).

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

4018520 is a wasteful number, since it uses less digits than its factorization.

4018520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9155 (or 9151 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 4018520 is about 2004.6246531458. The cubic root of 4018520 is about 158.9847169625.

Adding to 4018520 its reverse (258104), we get a square (4276624 = 2068²).

The spelling of 4018520 in words is "four million, eighteen thousand, five hundred twenty".