40539742821 has 24 divisors (see below), whose sum is σ = 59363380440. Its totient is φ = 26656413696.

The previous prime is 40539742777. The next prime is 40539742823. The reversal of 40539742821 is 12824793504.

40539742821 is a `hidden beast` number, since 4 + 0 + 539 + 74 + 28 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2587248225 + 37952494596 = 50865^2 + 194814^2 .

It is not a de Polignac number, because 40539742821 - 2¹⁵ = 40539710053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40539742823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 176545 + ... + 335033.

It is an arithmetic number, because the mean of its divisors is an integer number (2473474185).

Almost surely, 2^40539742821 is an apocalyptic number.

It is an amenable number.

40539742821 is a deficient number, since it is larger than the sum of its proper divisors (18823637619).

40539742821 is a wasteful number, since it uses less digits than its factorization.

40539742821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158885 (or 158882 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 40539742821 in words is "forty billion, five hundred thirty-nine million, seven hundred forty-two thousand, eight hundred twenty-one".