4000522 has 4 divisors (see below), whose sum is σ = 6000786. Its totient is φ = 2000260.

The previous prime is 4000511. The next prime is 4000523. The reversal of 4000522 is 2250004.

It is a happy number.

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., 3279721 + 720801 = 1811^2 + 849^2 .

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (4000523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000129 + ... + 1000132.

Almost surely, 2^4000522 is an apocalyptic number.

4000522 is a deficient number, since it is larger than the sum of its proper divisors (2000264).

4000522 is a wasteful number, since it uses less digits than its factorization.

4000522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000263.

The product of its (nonzero) digits is 80, while the sum is 13.

The square root of 4000522 is about 2000.1304957427. The cubic root of 4000522 is about 158.7470100910.

Adding to 4000522 its reverse (2250004), we get a palindrome (6250526).

The spelling of 4000522 in words is "four million, five hundred twenty-two", and thus it is an aban number.