393956138 has 8 divisors (see below), whose sum is σ = 599257440. Its totient is φ = 194203660.

The previous prime is 393956137. The next prime is 393956161. The reversal of 393956138 is 831659393.

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

It is a junction number, because it is equal to n+sod(n) for n = 393956092 and 393956101.

It is not an unprimeable number, because it can be changed into a prime (393956137) by changing a digit.

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, 1387028 + ... + 1387311.

It is an arithmetic number, because the mean of its divisors is an integer number (74907180).

Almost surely, 2^393956138 is an apocalyptic number.

393956138 is a deficient number, since it is larger than the sum of its proper divisors (205301302).

393956138 is a wasteful number, since it uses less digits than its factorization.

393956138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2774412.

The product of its digits is 524880, while the sum is 47.

The square root of 393956138 is about 19848.3283427094. The cubic root of 393956138 is about 733.0764877838.

The spelling of 393956138 in words is "three hundred ninety-three million, nine hundred fifty-six thousand, one hundred thirty-eight".