4389640 has 16 divisors (see below), whose sum is σ = 9876780. Its totient is φ = 1755840.

The previous prime is 4389611. The next prime is 4389647. The reversal of 4389640 is 469834.

It can be written as a sum of positive squares in 2 ways, for example, as 4153444 + 236196 = 2038^2 + 486^2 .

It is a junction number, because it is equal to n+sod(n) for n = 4389596 and 4389605.

It is not an unprimeable number, because it can be changed into a prime (4389647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54831 + ... + 54910.

Almost surely, 2^4389640 is an apocalyptic number.

4389640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4389640 is an abundant number, since it is smaller than the sum of its proper divisors (5487140).

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

4389640 is a wasteful number, since it uses less digits than its factorization.

4389640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109752 (or 109748 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 4389640 is about 2095.1467729016. The cubic root of 4389640 is about 163.7355444380.

The spelling of 4389640 in words is "four million, three hundred eighty-nine thousand, six hundred forty".