4040561 has 8 divisors (see below), whose sum is σ = 4705344. Its totient is φ = 3397680.

The previous prime is 4040549. The next prime is 4040563. The reversal of 4040561 is 1650404.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4040561 - 2¹⁰ = 4039537 is a prime.

It is a super-2 number, since 2×4040561² = 32652266389442, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4040563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5075 + ... + 5816.

It is an arithmetic number, because the mean of its divisors is an integer number (588168).

Almost surely, 2^4040561 is an apocalyptic number.

It is an amenable number.

4040561 is a deficient number, since it is larger than the sum of its proper divisors (664783).

4040561 is a wasteful number, since it uses less digits than its factorization.

4040561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10951.

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

The square root of 4040561 is about 2010.1146733458. The cubic root of 4040561 is about 159.2748565292.

Adding to 4040561 its reverse (1650404), we get a palindrome (5690965).

The spelling of 4040561 in words is "four million, forty thousand, five hundred sixty-one".