4201638 has 32 divisors (see below), whose sum is σ = 9745920. Its totient is φ = 1182720.

The previous prime is 4201633. The next prime is 4201649. The reversal of 4201638 is 8361024.

It is a happy number.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4201633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2278 + ... + 3686.

It is an arithmetic number, because the mean of its divisors is an integer number (304560).

Almost surely, 2^4201638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4201638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4872960).

4201638 is an abundant number, since it is smaller than the sum of its proper divisors (5544282).

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

4201638 is a wasteful number, since it uses less digits than its factorization.

4201638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1492.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 4201638 is about 2049.7897453154. The cubic root of 4201638 is about 161.3638364487.

The spelling of 4201638 in words is "four million, two hundred one thousand, six hundred thirty-eight".