40381037821 has 8 divisors (see below), whose sum is σ = 40767063480. Its totient is φ = 39995515392.

The previous prime is 40381037803. The next prime is 40381037843. The reversal of 40381037821 is 12873018304.

It can be written as a sum of positive squares in 4 ways, for example, as 3182200921 + 37198836900 = 56411^2 + 192870^2 .

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 40381037821 - 2⁵ = 40381037789 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 (40381037881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36441 + ... + 286513.

It is an arithmetic number, because the mean of its divisors is an integer number (5095882935).

Almost surely, 2^40381037821 is an apocalyptic number.

It is an amenable number.

40381037821 is a deficient number, since it is larger than the sum of its proper divisors (386025659).

40381037821 is a wasteful number, since it uses less digits than its factorization.

40381037821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251615.

The product of its (nonzero) digits is 32256, while the sum is 37.

The spelling of 40381037821 in words is "forty billion, three hundred eighty-one million, thirty-seven thousand, eight hundred twenty-one".