168690938 has 16 divisors (see below), whose sum is σ = 272723976. Its totient is φ = 77793600.

The previous prime is 168690931. The next prime is 168690953. The reversal of 168690938 is 839096861.

It can be written as a sum of positive squares in 4 ways, for example, as 120846049 + 47844889 = 10993^2 + 6917^2 .

It is not an unprimeable number, because it can be changed into a prime (168690931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47720 + ... + 51132.

Almost surely, 2^168690938 is an apocalyptic number.

168690938 is a deficient number, since it is larger than the sum of its proper divisors (104033038).

168690938 is a wasteful number, since it uses less digits than its factorization.

168690938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5329.

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 168690938 is about 12988.1075603800. The cubic root of 168690938 is about 552.5402472677.

The spelling of 168690938 in words is "one hundred sixty-eight million, six hundred ninety thousand, nine hundred thirty-eight".