168871905 has 32 divisors (see below), whose sum is σ = 316022400. Its totient is φ = 85323456.

The previous prime is 168871861. The next prime is 168871909. The reversal of 168871905 is 509178861.

It is not a de Polignac number, because 168871905 - 2⁶ = 168871841 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (168871909) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30354 + ... + 35483.

It is an arithmetic number, because the mean of its divisors is an integer number (9875700).

Almost surely, 2^168871905 is an apocalyptic number.

168871905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

168871905 is a deficient number, since it is larger than the sum of its proper divisors (147150495).

168871905 is a wasteful number, since it uses less digits than its factorization.

168871905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65870 (or 65864 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The square root of 168871905 is about 12995.0723353123. The cubic root of 168871905 is about 552.7377599841.

The spelling of 168871905 in words is "one hundred sixty-eight million, eight hundred seventy-one thousand, nine hundred five".