168381380 has 12 divisors (see below), whose sum is σ = 353600940. Its totient is φ = 67352544.

The previous prime is 168381377. The next prime is 168381391. The reversal of 168381380 is 83183861.

It can be written as a sum of positive squares in 2 ways, for example, as 39740416 + 128640964 = 6304^2 + 11342^2 .

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 3 ways as a sum of consecutive naturals, for example, 4209515 + ... + 4209554.

It is an arithmetic number, because the mean of its divisors is an integer number (29466745).

Almost surely, 2^168381380 is an apocalyptic number.

168381380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168381380 is an abundant number, since it is smaller than the sum of its proper divisors (185219560).

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

168381380 is a wasteful number, since it uses less digits than its factorization.

168381380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8419078 (or 8419076 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 168381380 is about 12976.1851096538. The cubic root of 168381380 is about 552.2020588079.

The spelling of 168381380 in words is "one hundred sixty-eight million, three hundred eighty-one thousand, three hundred eighty".