40520005385 has 8 divisors (see below), whose sum is σ = 50300696520. Its totient is φ = 31298210944.

The previous prime is 40520005381. The next prime is 40520005399. The reversal of 40520005385 is 58350002504.

It can be written as a sum of positive squares in 4 ways, for example, as 497602249 + 40022403136 = 22307^2 + 200056^2 .

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 40520005385 - 2² = 40520005381 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40520005381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139724012 + ... + 139724301.

It is an arithmetic number, because the mean of its divisors is an integer number (6287587065).

Almost surely, 2^40520005385 is an apocalyptic number.

It is an amenable number.

40520005385 is a deficient number, since it is larger than the sum of its proper divisors (9780691135).

40520005385 is a wasteful number, since it uses less digits than its factorization.

40520005385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279448347.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 40520005385 its reverse (58350002504), we get a palindrome (98870007889).

The spelling of 40520005385 in words is "forty billion, five hundred twenty million, five thousand, three hundred eighty-five".