4231640 has 96 divisors (see below), whose sum is σ = 11819520. Its totient is φ = 1354752.

The previous prime is 4231637. The next prime is 4231663. The reversal of 4231640 is 461324.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33257 + ... + 33383.

It is an arithmetic number, because the mean of its divisors is an integer number (123120).

Almost surely, 2^4231640 is an apocalyptic number.

4231640 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 4231640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5909760).

4231640 is an abundant number, since it is smaller than the sum of its proper divisors (7587880).

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

4231640 is a wasteful number, since it uses less digits than its factorization.

4231640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 4231640 is about 2057.0950391268. The cubic root of 4231640 is about 161.7470013228.

Adding to 4231640 its reverse (461324), we get a palindrome (4692964).

The spelling of 4231640 in words is "four million, two hundred thirty-one thousand, six hundred forty".