394138850028 has 288 divisors, whose sum is σ = 1197116444160. Its totient is φ = 98731776000.

The previous prime is 394138850023. The next prime is 394138850051. The reversal of 394138850028 is 820058831493.

It is not an unprimeable number, because it can be changed into a prime (394138850023) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 31776628 + ... + 31789028.

It is an arithmetic number, because the mean of its divisors is an integer number (4156654320).

Almost surely, 2^394138850028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 394138850028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (598558222080).

394138850028 is an abundant number, since it is smaller than the sum of its proper divisors (802977594132).

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

394138850028 is a wasteful number, since it uses less digits than its factorization.

394138850028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12549 (or 12536 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 51.

The spelling of 394138850028 in words is "three hundred ninety-four billion, one hundred thirty-eight million, eight hundred fifty thousand, twenty-eight".