168404038388 has 12 divisors (see below), whose sum is σ = 294712138980. Its totient is φ = 84200570112.

The previous prime is 168404038381. The next prime is 168404038393. The reversal of 168404038388 is 883830404861.

It can be written as a sum of positive squares in 2 ways, for example, as 22328727184 + 146075311204 = 149428^2 + 382198^2 .

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168404038381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75581 + ... + 585252.

It is an arithmetic number, because the mean of its divisors is an integer number (24559344915).

Almost surely, 2^168404038388 is an apocalyptic number.

It is an amenable number.

168404038388 is a deficient number, since it is larger than the sum of its proper divisors (126308100592).

168404038388 is a wasteful number, since it uses less digits than its factorization.

168404038388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724546 (or 724544 counting only the distinct ones).

The product of its (nonzero) digits is 3538944, while the sum is 53.

The spelling of 168404038388 in words is "one hundred sixty-eight billion, four hundred four million, thirty-eight thousand, three hundred eighty-eight".