168181340 has 24 divisors (see below), whose sum is σ = 373956912. Its totient is φ = 63315200.

The previous prime is 168181333. The next prime is 168181367. The reversal of 168181340 is 43181861.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 168181297 and 168181306.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 246986 + ... + 247665.

It is an arithmetic number, because the mean of its divisors is an integer number (15581538).

Almost surely, 2^168181340 is an apocalyptic number.

168181340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168181340 is an abundant number, since it is smaller than the sum of its proper divisors (205775572).

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

168181340 is a wasteful number, since it uses less digits than its factorization.

168181340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494677 (or 494675 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 168181340 is about 12968.4748525029. The cubic root of 168181340 is about 551.9832969461.

The spelling of 168181340 in words is "one hundred sixty-eight million, one hundred eighty-one thousand, three hundred forty".