163869 has 4 divisors (see below), whose sum is σ = 218496. Its totient is φ = 109244.

The previous prime is 163861. The next prime is 163871. The reversal of 163869 is 968361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 163869 - 2³ = 163861 is a prime.

It is a super-2 number, since 2×163869² = 53706098322, which contains 22 as substring.

It is a D-number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27309 + ... + 27314.

It is an arithmetic number, because the mean of its divisors is an integer number (54624).

2¹⁶³⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

163869 is a deficient number, since it is larger than the sum of its proper divisors (54627).

163869 is an equidigital number, since it uses as much as digits as its factorization.

163869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54626.

The product of its digits is 7776, while the sum is 33.

The square root of 163869 is about 404.8073615931. The cubic root of 163869 is about 54.7224585734.

The spelling of 163869 in words is "one hundred sixty-three thousand, eight hundred sixty-nine".