168813940 has 24 divisors (see below), whose sum is σ = 355209120. Its totient is φ = 67392288.

The previous prime is 168813929. The next prime is 168813947. The reversal of 168813940 is 49318861.

It is a junction number, because it is equal to n+sod(n) for n = 168813893 and 168813902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168813947) 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, 2391 + ... + 18529.

It is an arithmetic number, because the mean of its divisors is an integer number (14800380).

Almost surely, 2^168813940 is an apocalyptic number.

168813940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168813940 is an abundant number, since it is smaller than the sum of its proper divisors (186395180).

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

168813940 is a wasteful number, since it uses less digits than its factorization.

168813940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16671 (or 16669 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 168813940 is about 12992.8418754328. The cubic root of 168813940 is about 552.6745106417.

The spelling of 168813940 in words is "one hundred sixty-eight million, eight hundred thirteen thousand, nine hundred forty".