4021002 has 20 divisors (see below), whose sum is σ = 9010386. Its totient is φ = 1340280.

The previous prime is 4021001. The next prime is 4021009. The reversal of 4021002 is 2001204.

It can be written as a sum of positive squares in only one way, i.e., 3884841 + 136161 = 1971^2 + 369^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (4021001) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 12249 + ... + 12572.

Almost surely, 2^4021002 is an apocalyptic number.

4021002 is an abundant number, since it is smaller than the sum of its proper divisors (4989384).

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

4021002 is a wasteful number, since it uses less digits than its factorization.

4021002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24835 (or 24826 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 4021002 is about 2005.2436260963. The cubic root of 4021002 is about 159.0174420168.

Adding to 4021002 its reverse (2001204), we get a palindrome (6022206).

The spelling of 4021002 in words is "four million, twenty-one thousand, two".