168538387 has 2 divisors, whose sum is σ = 168538388. Its totient is φ = 168538386.

The previous prime is 168538339. The next prime is 168538507. The reversal of 168538387 is 783835861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 168538387 - 2¹⁵ = 168505619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 168538387.

It is not a weakly prime, because it can be changed into another prime (168538787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84269193 + 84269194.

It is an arithmetic number, because the mean of its divisors is an integer number (84269194).

Almost surely, 2^168538387 is an apocalyptic number.

168538387 is a deficient number, since it is larger than the sum of its proper divisors (1).

168538387 is an equidigital number, since it uses as much as digits as its factorization.

168538387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 49.

The square root of 168538387 is about 12982.2335135369. The cubic root of 168538387 is about 552.3736388542.

The spelling of 168538387 in words is "one hundred sixty-eight million, five hundred thirty-eight thousand, three hundred eighty-seven".