168142005 has 18 divisors (see below), whose sum is σ = 291596994. Its totient is φ = 89629344.

The previous prime is 168142003. The next prime is 168142021. The reversal of 168142005 is 500241861.

It can be written as a sum of positive squares in 3 ways, for example, as 39614436 + 128527569 = 6294^2 + 11337^2 .

It is not a de Polignac number, because 168142005 - 2¹ = 168142003 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 168142005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168142003) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 86019 + ... + 87951.

It is an arithmetic number, because the mean of its divisors is an integer number (16199833).

Almost surely, 2^168142005 is an apocalyptic number.

168142005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

168142005 is a deficient number, since it is larger than the sum of its proper divisors (123454989).

168142005 is an frugal number, since it uses more digits than its factorization.

168142005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3877 (or 1941 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 168142005 is about 12966.9582015213. The cubic root of 168142005 is about 551.9402601543.

Adding to 168142005 its reverse (500241861), we get a palindrome (668383866).

The spelling of 168142005 in words is "one hundred sixty-eight million, one hundred forty-two thousand, five".