168399562 has 4 divisors (see below), whose sum is σ = 252599346. Its totient is φ = 84199780.

The previous prime is 168399551. The next prime is 168399563. The reversal of 168399562 is 265993861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 265993861 = 7 ⋅37999123.

It can be written as a sum of positive squares in only one way, i.e., 109432521 + 58967041 = 10461^2 + 7679^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (168399563) 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, 42099889 + ... + 42099892.

Almost surely, 2^168399562 is an apocalyptic number.

168399562 is a deficient number, since it is larger than the sum of its proper divisors (84199784).

168399562 is an equidigital number, since it uses as much as digits as its factorization.

168399562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84199783.

The product of its digits is 699840, while the sum is 49.

The square root of 168399562 is about 12976.8856818576. The cubic root of 168399562 is about 552.2219338805.

The spelling of 168399562 in words is "one hundred sixty-eight million, three hundred ninety-nine thousand, five hundred sixty-two".