4000538 has 4 divisors (see below), whose sum is σ = 6000810. Its totient is φ = 2000268.

The previous prime is 4000523. The next prime is 4000541. The reversal of 4000538 is 8350004.

4000538 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.

It can be written as a sum of positive squares in only one way, i.e., 2455489 + 1545049 = 1567^2 + 1243^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1000133 + ... + 1000136.

Almost surely, 2^4000538 is an apocalyptic number.

4000538 is a deficient number, since it is larger than the sum of its proper divisors (2000272).

4000538 is a wasteful number, since it uses less digits than its factorization.

4000538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2000271.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 4000538 is about 2000.1344954777. The cubic root of 4000538 is about 158.7472217258.

The spelling of 4000538 in words is "four million, five hundred thirty-eight", and thus it is an aban number.