168396993 has 6 divisors (see below), whose sum is σ = 243240114. Its totient is φ = 112264656.

The previous prime is 168396973. The next prime is 168397003. The reversal of 168396993 is 399693861.

168396993 is a `hidden beast` number, since 168 + 396 + 9 + 93 = 666.

It can be written as a sum of positive squares in only one way, i.e., 104284944 + 64112049 = 10212^2 + 8007^2 .

It is not a de Polignac number, because 168396993 - 2¹⁴ = 168380609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (168396913) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9355380 + ... + 9355397.

It is an arithmetic number, because the mean of its divisors is an integer number (40540019).

Almost surely, 2^168396993 is an apocalyptic number.

It is an amenable number.

168396993 is a deficient number, since it is larger than the sum of its proper divisors (74843121).

168396993 is a wasteful number, since it uses less digits than its factorization.

168396993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18710783 (or 18710780 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 54.

The square root of 168396993 is about 12976.7866977923. The cubic root of 168396993 is about 552.2191257470.

It can be divided in two parts, 16839 and 6993, that added together give a palindrome (23832).

The spelling of 168396993 in words is "one hundred sixty-eight million, three hundred ninety-six thousand, nine hundred ninety-three".