393986477838 has 16 divisors (see below), whose sum is σ = 791506469376. Its totient is φ = 130739907000.

The previous prime is 393986477831. The next prime is 393986477869. The reversal of 393986477838 is 838774689393.

It is a self number, because there is not a number n which added to its sum of digits gives 393986477838.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393986477831) 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, 147228288 + ... + 147230963.

It is an arithmetic number, because the mean of its divisors is an integer number (49469154336).

Almost surely, 2^393986477838 is an apocalyptic number.

393986477838 is an abundant number, since it is smaller than the sum of its proper divisors (397519991538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

393986477838 is a wasteful number, since it uses less digits than its factorization.

393986477838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294459479.

The product of its digits is 1316818944, while the sum is 75.

The spelling of 393986477838 in words is "three hundred ninety-three billion, nine hundred eighty-six million, four hundred seventy-seven thousand, eight hundred thirty-eight".