4000641 has 4 divisors (see below), whose sum is σ = 5334192. Its totient is φ = 2667092.

The previous prime is 4000631. The next prime is 4000649. The reversal of 4000641 is 1460004.

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 a de Polignac number, because none of the positive numbers 2^k-4000641 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 4000641.

It is not an unprimeable number, because it can be changed into a prime (4000649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666771 + ... + 666776.

It is an arithmetic number, because the mean of its divisors is an integer number (1333548).

Almost surely, 2^4000641 is an apocalyptic number.

It is an amenable number.

4000641 is a deficient number, since it is larger than the sum of its proper divisors (1333551).

4000641 is a wasteful number, since it uses less digits than its factorization.

4000641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333550.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 4000641 is about 2000.1602435805. The cubic root of 4000641 is about 158.7485841112.

Adding to 4000641 its reverse (1460004), we get a palindrome (5460645).

It can be divided in two parts, 400064 and 1, that added together give a triangular number (400065 = T₈₉₄).

The spelling of 4000641 in words is "four million, six hundred forty-one", and thus it is an aban number.