163867840 has 56 divisors (see below), whose sum is σ = 399318480. Its totient is φ = 64017408.

The previous prime is 163867789. The next prime is 163867859. The reversal of 163867840 is 48768361.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7806 + ... + 19714.

Almost surely, 2^163867840 is an apocalyptic number.

163867840 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 163867840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199659240).

163867840 is an abundant number, since it is smaller than the sum of its proper divisors (235450640).

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

163867840 is a wasteful number, since it uses less digits than its factorization.

163867840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11969 (or 11959 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 163867840 is about 12801.0874538064. The cubic root of 163867840 is about 547.2232944953.

The spelling of 163867840 in words is "one hundred sixty-three million, eight hundred sixty-seven thousand, eight hundred forty".