40937821 has 4 divisors (see below), whose sum is σ = 42349500. Its totient is φ = 39526144.

The previous prime is 40937807. The next prime is 40937839. The reversal of 40937821 is 12873904.

40937821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 27941796 + 12996025 = 5286^2 + 3605^2 .

It is a cyclic number.

It is not a de Polignac number, because 40937821 - 2⁷ = 40937693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40937851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705796 + ... + 705853.

It is an arithmetic number, because the mean of its divisors is an integer number (10587375).

Almost surely, 2^40937821 is an apocalyptic number.

It is an amenable number.

40937821 is a deficient number, since it is larger than the sum of its proper divisors (1411679).

40937821 is a wasteful number, since it uses less digits than its factorization.

40937821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411678.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 40937821 is about 6398.2670310014. The cubic root of 40937821 is about 344.6473214544.

The spelling of 40937821 in words is "forty million, nine hundred thirty-seven thousand, eight hundred twenty-one".