163856380 has 48 divisors (see below), whose sum is σ = 374724000. Its totient is φ = 59947776.

The previous prime is 163856369. The next prime is 163856383. The reversal of 163856380 is 83658361.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163856383) 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 15 ways as a sum of consecutive naturals, for example, 3586 + ... + 18454.

It is an arithmetic number, because the mean of its divisors is an integer number (7806750).

Almost surely, 2^163856380 is an apocalyptic number.

163856380 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 163856380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187362000).

163856380 is an abundant number, since it is smaller than the sum of its proper divisors (210867620).

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

163856380 is a wasteful number, since it uses less digits than its factorization.

163856380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14926 (or 14924 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 163856380 is about 12800.6398277586. The cubic root of 163856380 is about 547.2105376193.

The spelling of 163856380 in words is "one hundred sixty-three million, eight hundred fifty-six thousand, three hundred eighty".