4989640 has 32 divisors (see below), whose sum is σ = 11376000. Its totient is φ = 1969344.

The previous prime is 4989637. The next prime is 4989641. The reversal of 4989640 is 469894.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 4989593 and 4989602.

It is not an unprimeable number, because it can be changed into a prime (4989641) 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, 2371 + ... + 3949.

It is an arithmetic number, because the mean of its divisors is an integer number (355500).

Almost surely, 2^4989640 is an apocalyptic number.

4989640 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 4989640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5688000).

4989640 is an abundant number, since it is smaller than the sum of its proper divisors (6386360).

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

4989640 is a wasteful number, since it uses less digits than its factorization.

4989640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669 (or 1665 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 4989640 is about 2233.7502098489. The cubic root of 4989640 is about 170.8794106656.

The spelling of 4989640 in words is "four million, nine hundred eighty-nine thousand, six hundred forty".