163685940 has 192 divisors, whose sum is σ = 536481792. Its totient is φ = 36889600.

The previous prime is 163685939. The next prime is 163685957. The reversal of 163685940 is 49586361.

It is a junction number, because it is equal to n+sod(n) for n = 163685892 and 163685901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 622249 + ... + 622511.

It is an arithmetic number, because the mean of its divisors is an integer number (2794176).

Almost surely, 2^163685940 is an apocalyptic number.

163685940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163685940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268240896).

163685940 is an abundant number, since it is smaller than the sum of its proper divisors (372795852).

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

163685940 is a wasteful number, since it uses less digits than its factorization.

163685940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350 (or 348 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 163685940 is about 12793.9806158990. The cubic root of 163685940 is about 547.0207394543.

The spelling of 163685940 in words is "one hundred sixty-three million, six hundred eighty-five thousand, nine hundred forty".