394263738 has 72 divisors (see below), whose sum is σ = 945756084. Its totient is φ = 118609920.

The previous prime is 394263731. The next prime is 394263739. The reversal of 394263738 is 837362493.

394263738 is a `hidden beast` number, since 3 + 9 + 4 + 2 + 637 + 3 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 393347889 + 915849 = 19833^2 + 957^2 .

It is a junction number, because it is equal to n+sod(n) for n = 394263693 and 394263702.

It is not an unprimeable number, because it can be changed into a prime (394263731) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 341370 + ... + 342522.

Almost surely, 2^394263738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 394263738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (472878042).

394263738 is an abundant number, since it is smaller than the sum of its proper divisors (551492346).

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

394263738 is a wasteful number, since it uses less digits than its factorization.

394263738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340 (or 1326 counting only the distinct ones).

The product of its digits is 653184, while the sum is 45.

The square root of 394263738 is about 19856.0755941349. The cubic root of 394263738 is about 733.2672329310.

The spelling of 394263738 in words is "three hundred ninety-four million, two hundred sixty-three thousand, seven hundred thirty-eight".