168990929 has 4 divisors (see below), whose sum is σ = 169018980. Its totient is φ = 168962880.

The previous prime is 168990919. The next prime is 168990947. The reversal of 168990929 is 929099861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59830225 + 109160704 = 7735^2 + 10448^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168990929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168990919) 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 in 3 ways as a sum of consecutive naturals, for example, 884 + ... + 18405.

It is an arithmetic number, because the mean of its divisors is an integer number (42254745).

Almost surely, 2^168990929 is an apocalyptic number.

It is an amenable number.

168990929 is a deficient number, since it is larger than the sum of its proper divisors (28051).

168990929 is an equidigital number, since it uses as much as digits as its factorization.

168990929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28050.

The product of its (nonzero) digits is 629856, while the sum is 53.

The square root of 168990929 is about 12999.6511107029. The cubic root of 168990929 is about 552.8675893731.

The spelling of 168990929 in words is "one hundred sixty-eight million, nine hundred ninety thousand, nine hundred twenty-nine".