4401640 has 32 divisors (see below), whose sum is σ = 10487880. Its totient is φ = 1656832.

The previous prime is 4401601. The next prime is 4401641. The reversal of 4401640 is 461044.

It can be written as a sum of positive squares in 4 ways, for example, as 3437316 + 964324 = 1854^2 + 982^2 .

It is not an unprimeable number, because it can be changed into a prime (4401641) 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, 2557 + ... + 3916.

Almost surely, 2^4401640 is an apocalyptic number.

4401640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4401640 is an abundant number, since it is smaller than the sum of its proper divisors (6086240).

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

4401640 is a wasteful number, since it uses less digits than its factorization.

4401640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6501 (or 6497 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 4401640 is about 2098.0085795821. The cubic root of 4401640 is about 163.8846104834.

Adding to 4401640 its reverse (461044), we get a palindrome (4862684).

It can be divided in two parts, 4401 and 640, that added together give a square (5041 = 71²).

The spelling of 4401640 in words is "four million, four hundred one thousand, six hundred forty".