4008521 has 4 divisors (see below), whose sum is σ = 4372944. Its totient is φ = 3644100.

The previous prime is 4008461. The next prime is 4008523. The reversal of 4008521 is 1258004.

4008521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4008521 - 2¹⁸ = 3746377 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4008493 and 4008502.

It is not an unprimeable number, because it can be changed into a prime (4008523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182195 + ... + 182216.

It is an arithmetic number, because the mean of its divisors is an integer number (1093236).

Almost surely, 2^4008521 is an apocalyptic number.

It is an amenable number.

4008521 is a deficient number, since it is larger than the sum of its proper divisors (364423).

4008521 is a wasteful number, since it uses less digits than its factorization.

4008521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364422.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 4008521 is about 2002.1291167155. The cubic root of 4008521 is about 158.8527439548.

The spelling of 4008521 in words is "four million, eight thousand, five hundred twenty-one".