4021650 has 72 divisors (see below), whose sum is σ = 11238864. Its totient is φ = 1069200.

The previous prime is 4021627. The next prime is 4021651. The reversal of 4021650 is 561204.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (4021651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 11985 + ... + 12315.

Almost surely, 2^4021650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4021650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5619432).

4021650 is an abundant number, since it is smaller than the sum of its proper divisors (7217214).

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

4021650 is a wasteful number, since it uses less digits than its factorization.

4021650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358 (or 341 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 4021650 is about 2005.4051959641. The cubic root of 4021650 is about 159.0259836496.

Adding to 4021650 its reverse (561204), we get a palindrome (4582854).

The spelling of 4021650 in words is "four million, twenty-one thousand, six hundred fifty".