163870 has 16 divisors (see below), whose sum is σ = 337248. Its totient is φ = 56160.

The previous prime is 163861. The next prime is 163871. The reversal of 163870 is 78361.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1101 + ... + 1240.

It is an arithmetic number, because the mean of its divisors is an integer number (21078).

2¹⁶³⁸⁷⁰ is an apocalyptic number.

163870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

163870 is an abundant number, since it is smaller than the sum of its proper divisors (173378).

It is a weird number, because it is abundant, but not a pseudoperfect number.

163870 is a wasteful number, since it uses less digits than its factorization.

163870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2355.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 163870 is about 404.8085967467. The cubic root of 163870 is about 54.7225698866.

The spelling of 163870 in words is "one hundred sixty-three thousand, eight hundred seventy".