163904240 has 40 divisors (see below), whose sum is σ = 384470928. Its totient is φ = 64977920.

The previous prime is 163904219. The next prime is 163904243. The reversal of 163904240 is 42409361.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163904243) 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, 26 + ... + 18105.

Almost surely, 2^163904240 is an apocalyptic number.

163904240 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 163904240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192235464).

163904240 is an abundant number, since it is smaller than the sum of its proper divisors (220566688).

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

163904240 is a wasteful number, since it uses less digits than its factorization.

163904240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18257 (or 18251 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 163904240 is about 12802.5091290731. The cubic root of 163904240 is about 547.2638097732.

The spelling of 163904240 in words is "one hundred sixty-three million, nine hundred four thousand, two hundred forty".