4538440 has 32 divisors (see below), whose sum is σ = 10342080. Its totient is φ = 1792192.

The previous prime is 4538407. The next prime is 4538441. The reversal of 4538440 is 448354.

It is a junction number, because it is equal to n+sod(n) for n = 4538399 and 4538408.

It is not an unprimeable number, because it can be changed into a prime (4538441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2637 + ... + 4003.

It is an arithmetic number, because the mean of its divisors is an integer number (323190).

Almost surely, 2^4538440 is an apocalyptic number.

4538440 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 4538440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5171040).

4538440 is an abundant number, since it is smaller than the sum of its proper divisors (5803640).

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

4538440 is a wasteful number, since it uses less digits than its factorization.

4538440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461 (or 1457 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 4538440 is about 2130.3614716756. The cubic root of 4538440 is about 165.5651268099.

The spelling of 4538440 in words is "four million, five hundred thirty-eight thousand, four hundred forty".