168391947 has 32 divisors (see below), whose sum is σ = 240569856. Its totient is φ = 104544000.

The previous prime is 168391891. The next prime is 168391963. The reversal of 168391947 is 749193861.

It is a happy number.

It is not a de Polignac number, because 168391947 - 2⁷ = 168391819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 168391896 and 168391905.

It is not an unprimeable number, because it can be changed into a prime (168391747) 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, 508572 + ... + 508902.

It is an arithmetic number, because the mean of its divisors is an integer number (7517808).

Almost surely, 2^168391947 is an apocalyptic number.

168391947 is a deficient number, since it is larger than the sum of its proper divisors (72177909).

168391947 is a wasteful number, since it uses less digits than its factorization.

168391947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531.

The product of its digits is 326592, while the sum is 48.

The square root of 168391947 is about 12976.5922722416. The cubic root of 168391947 is about 552.2136099606.

The spelling of 168391947 in words is "one hundred sixty-eight million, three hundred ninety-one thousand, nine hundred forty-seven".