393780138 has 8 divisors (see below), whose sum is σ = 787560288. Its totient is φ = 131260044.

The previous prime is 393780109. The next prime is 393780157. The reversal of 393780138 is 831087393.

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

393780138 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 393780138.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 32815006 + ... + 32815017.

It is an arithmetic number, because the mean of its divisors is an integer number (98445036).

Almost surely, 2^393780138 is an apocalyptic number.

393780138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

393780138 is a wasteful number, since it uses less digits than its factorization.

393780138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65630028.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 393780138 is about 19843.8942246727. The cubic root of 393780138 is about 732.9673041568.

The spelling of 393780138 in words is "three hundred ninety-three million, seven hundred eighty thousand, one hundred thirty-eight".