168840037 has 2 divisors, whose sum is σ = 168840038. Its totient is φ = 168840036.

The previous prime is 168840013. The next prime is 168840047. The reversal of 168840037 is 730048861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158911236 + 9928801 = 12606^2 + 3151^2 .

It is an emirp because it is prime and its reverse (730048861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 168840037 - 2¹¹ = 168837989 is a prime.

It is a super-2 number, since 2×168840037² = 57013916188322738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 168839978 and 168840005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168840047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84420018 + 84420019.

It is an arithmetic number, because the mean of its divisors is an integer number (84420019).

Almost surely, 2^168840037 is an apocalyptic number.

It is an amenable number.

168840037 is a deficient number, since it is larger than the sum of its proper divisors (1).

168840037 is an equidigital number, since it uses as much as digits as its factorization.

168840037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 168840037 is about 12993.8461203756. The cubic root of 168840037 is about 552.7029885497.

Adding to 168840037 its reverse (730048861), we get a palindrome (898888898).

The spelling of 168840037 in words is "one hundred sixty-eight million, eight hundred forty thousand, thirty-seven".