168217538 has 8 divisors (see below), whose sum is σ = 263297088. Its totient is φ = 80451844.

The previous prime is 168217537. The next prime is 168217541. The reversal of 168217538 is 835712861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 168217495 and 168217504.

It is not an unprimeable number, because it can be changed into a prime (168217537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1828406 + ... + 1828497.

It is an arithmetic number, because the mean of its divisors is an integer number (32912136).

Almost surely, 2^168217538 is an apocalyptic number.

168217538 is a deficient number, since it is larger than the sum of its proper divisors (95079550).

168217538 is a wasteful number, since it uses less digits than its factorization.

168217538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3656928.

The product of its digits is 80640, while the sum is 41.

The square root of 168217538 is about 12969.8703925675. The cubic root of 168217538 is about 552.0228955882.

The spelling of 168217538 in words is "one hundred sixty-eight million, two hundred seventeen thousand, five hundred thirty-eight".