40020204394 has 8 divisors (see below), whose sum is σ = 60852639780. Its totient is φ = 19735991136.

The previous prime is 40020204383. The next prime is 40020204449. The reversal of 40020204394 is 49340202004.

It can be written as a sum of positive squares in 2 ways, for example, as 37331263369 + 2688941025 = 193213^2 + 51855^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 137055349 + ... + 137055640.

Almost surely, 2^40020204394 is an apocalyptic number.

40020204394 is a deficient number, since it is larger than the sum of its proper divisors (20832435386).

40020204394 is a wasteful number, since it uses less digits than its factorization.

40020204394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274111064.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 40020204394 its reverse (49340202004), we get a palindrome (89360406398).

The spelling of 40020204394 in words is "forty billion, twenty million, two hundred four thousand, three hundred ninety-four".