40643841 has 16 divisors (see below), whose sum is σ = 62720000. Its totient is φ = 22930128.

The previous prime is 40643839. The next prime is 40643849. The reversal of 40643841 is 14834604.

It is not a de Polignac number, because 40643841 - 2¹ = 40643839 is a prime.

It is a super-2 number, since 2×40643841² = 3303843622466562, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40643799 and 40643808.

It is not an unprimeable number, because it can be changed into a prime (40643849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10591 + ... + 13908.

It is an arithmetic number, because the mean of its divisors is an integer number (3920000).

Almost surely, 2^40643841 is an apocalyptic number.

It is an amenable number.

40643841 is a deficient number, since it is larger than the sum of its proper divisors (22076159).

40643841 is a wasteful number, since it uses less digits than its factorization.

40643841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24588.

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 40643841 is about 6375.2522303043. The cubic root of 40643841 is about 343.8203524986.

The spelling of 40643841 in words is "forty million, six hundred forty-three thousand, eight hundred forty-one".