4006018 has 4 divisors (see below), whose sum is σ = 6009030. Its totient is φ = 2003008.

The previous prime is 4006007. The next prime is 4006019. The reversal of 4006018 is 8106004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2082249 + 1923769 = 1443^2 + 1387^2 .

It is a junction number, because it is equal to n+sod(n) for n = 4005986 and 4006004.

It is not an unprimeable number, because it can be changed into a prime (4006019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001503 + ... + 1001506.

Almost surely, 2^4006018 is an apocalyptic number.

4006018 is a deficient number, since it is larger than the sum of its proper divisors (2003012).

4006018 is a wasteful number, since it uses less digits than its factorization.

4006018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2003011.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 4006018 is about 2001.5039345452. The cubic root of 4006018 is about 158.8196734694.

The spelling of 4006018 in words is "four million, six thousand, eighteen".