4006642 has 4 divisors (see below), whose sum is σ = 6009966. Its totient is φ = 2003320.

The previous prime is 4006637. The next prime is 4006649. The reversal of 4006642 is 2466004.

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., 3884841 + 121801 = 1971^2 + 349^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (4006649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001659 + ... + 1001662.

Almost surely, 2^4006642 is an apocalyptic number.

4006642 is a deficient number, since it is larger than the sum of its proper divisors (2003324).

4006642 is a wasteful number, since it uses less digits than its factorization.

4006642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2003323.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 4006642 is about 2001.6598112566. The cubic root of 4006642 is about 158.8279192579.

The spelling of 4006642 in words is "four million, six thousand, six hundred forty-two".