41904721 has 4 divisors (see below), whose sum is σ = 41998500. Its totient is φ = 41810944.

The previous prime is 41904719. The next prime is 41904727. The reversal of 41904721 is 12740914.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17943696 + 23961025 = 4236^2 + 4895^2 .

It is a cyclic number.

It is not a de Polignac number, because 41904721 - 2¹ = 41904719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 41904721.

It is not an unprimeable number, because it can be changed into a prime (41904727) 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, 46216 + ... + 47113.

It is an arithmetic number, because the mean of its divisors is an integer number (10499625).

Almost surely, 2^41904721 is an apocalyptic number.

It is an amenable number.

41904721 is a deficient number, since it is larger than the sum of its proper divisors (93779).

41904721 is an equidigital number, since it uses as much as digits as its factorization.

41904721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93778.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 41904721 is about 6473.3855902456. The cubic root of 41904721 is about 347.3396144087.

It can be divided in two parts, 4190 and 4721, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 41904721 in words is "forty-one million, nine hundred four thousand, seven hundred twenty-one".