43420520 has 64 divisors (see below), whose sum is σ = 114791040. Its totient is φ = 14572800.

The previous prime is 43420513. The next prime is 43420523. The reversal of 43420520 is 2502434.

It is a super-3 number, since 3×43420520³ (a number of 24 digits) contains 333 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 = 43420492 and 43420501.

It is not an unprimeable number, because it can be changed into a prime (43420523) 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, 1925 + ... + 9515.

It is an arithmetic number, because the mean of its divisors is an integer number (1793610).

Almost surely, 2^43420520 is an apocalyptic number.

43420520 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 43420520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57395520).

43420520 is an abundant number, since it is smaller than the sum of its proper divisors (71370520).

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

43420520 is a wasteful number, since it uses less digits than its factorization.

43420520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7626 (or 7622 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 43420520 is about 6589.4248610937. The cubic root of 43420520 is about 351.4781566689.

Adding to 43420520 its reverse (2502434), we get a palindrome (45922954).

The spelling of 43420520 in words is "forty-three million, four hundred twenty thousand, five hundred twenty".