163845840 has 80 divisors (see below), whose sum is σ = 520341696. Its totient is φ = 42624000.

The previous prime is 163845839. The next prime is 163845883. The reversal of 163845840 is 48548361.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1515 + ... + 18165.

Almost surely, 2^163845840 is an apocalyptic number.

163845840 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 163845840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260170848).

163845840 is an abundant number, since it is smaller than the sum of its proper divisors (356495856).

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

163845840 is a wasteful number, since it uses less digits than its factorization.

163845840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16708 (or 16702 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 163845840 is about 12800.2281229672. The cubic root of 163845840 is about 547.1988043303.

The spelling of 163845840 in words is "one hundred sixty-three million, eight hundred forty-five thousand, eight hundred forty".