394163644 has 36 divisors (see below), whose sum is σ = 806682240. Its totient is φ = 168026880.

The previous prime is 394163641. The next prime is 394163669. The reversal of 394163644 is 446361493.

It is a junction number, because it is equal to n+sod(n) for n = 394163597 and 394163606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394163641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32172 + ... + 42700.

It is an arithmetic number, because the mean of its divisors is an integer number (22407840).

Almost surely, 2^394163644 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 394163644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (403341120).

394163644 is an abundant number, since it is smaller than the sum of its proper divisors (412518596).

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

394163644 is a wasteful number, since it uses less digits than its factorization.

394163644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10738 (or 10729 counting only the distinct ones).

The product of its digits is 186624, while the sum is 40.

The square root of 394163644 is about 19853.5549461551. The cubic root of 394163644 is about 733.2051747574.

The spelling of 394163644 in words is "three hundred ninety-four million, one hundred sixty-three thousand, six hundred forty-four".