169868399 has 4 divisors (see below), whose sum is σ = 175725960. Its totient is φ = 164010840.

The previous prime is 169868393. The next prime is 169868411. The reversal of 169868399 is 993868961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993868961 = 7001 ⋅141961.

It is a cyclic number.

It is not a de Polignac number, because 169868399 - 2⁸ = 169868143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169868393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2928737 + ... + 2928794.

It is an arithmetic number, because the mean of its divisors is an integer number (43931490).

Almost surely, 2^169868399 is an apocalyptic number.

169868399 is a deficient number, since it is larger than the sum of its proper divisors (5857561).

169868399 is an equidigital number, since it uses as much as digits as its factorization.

169868399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5857560.

The product of its digits is 5038848, while the sum is 59.

The square root of 169868399 is about 13033.3571653661. The cubic root of 169868399 is about 553.8228427802.

The spelling of 169868399 in words is "one hundred sixty-nine million, eight hundred sixty-eight thousand, three hundred ninety-nine".