40944581 has 4 divisors (see below), whose sum is σ = 41045100. Its totient is φ = 40844064.

The previous prime is 40944529. The next prime is 40944599. The reversal of 40944581 is 18544904.

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 2 ways, for example, as 20160100 + 20784481 = 4490^2 + 4559^2 .

It is a cyclic number.

It is not a de Polignac number, because 40944581 - 2¹⁸ = 40682437 is a prime.

It is a super-2 number, since 2×40944581² = 3352917426531122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40944511) 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, 49646 + ... + 50463.

It is an arithmetic number, because the mean of its divisors is an integer number (10261275).

Almost surely, 2^40944581 is an apocalyptic number.

It is an amenable number.

40944581 is a deficient number, since it is larger than the sum of its proper divisors (100519).

40944581 is a wasteful number, since it uses less digits than its factorization.

40944581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100518.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 40944581 is about 6398.7952772377. The cubic root of 40944581 is about 344.6662907727. Note that the first 3 decimals are identical.

The spelling of 40944581 in words is "forty million, nine hundred forty-four thousand, five hundred eighty-one".