163640 has 16 divisors (see below), whose sum is σ = 368280. Its totient is φ = 65440.

The previous prime is 163637. The next prime is 163643. The reversal of 163640 is 46361.

It is an interprime number because it is at equal distance from previous prime (163637) and next prime (163643).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2006 + ... + 2085.

2¹⁶³⁶⁴⁰ is an apocalyptic number.

163640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163640 is an abundant number, since it is smaller than the sum of its proper divisors (204640).

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

163640 is a wasteful number, since it uses less digits than its factorization.

163640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4102 (or 4098 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 163640 is about 404.5244121187. The cubic root of 163640 is about 54.6969559159.

The spelling of 163640 in words is "one hundred sixty-three thousand, six hundred forty".