163903840 has 24 divisors (see below), whose sum is σ = 387223200. Its totient is φ = 65561472.

The previous prime is 163903811. The next prime is 163903841. The reversal of 163903840 is 48309361.

It is a junction number, because it is equal to n+sod(n) for n = 163903796 and 163903805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163903841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 512040 + ... + 512359.

It is an arithmetic number, because the mean of its divisors is an integer number (16134300).

Almost surely, 2^163903840 is an apocalyptic number.

163903840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163903840 is an abundant number, since it is smaller than the sum of its proper divisors (223319360).

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

163903840 is a wasteful number, since it uses less digits than its factorization.

163903840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024414 (or 1024406 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 163903840 is about 12802.4935071259. The cubic root of 163903840 is about 547.2633645829.

The spelling of 163903840 in words is "one hundred sixty-three million, nine hundred three thousand, eight hundred forty".