168211904 has 42 divisors (see below), whose sum is σ = 388299960. Its totient is φ = 72089472.

The previous prime is 168211873. The next prime is 168211909. The reversal of 168211904 is 409112861.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168211909) 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 5 ways as a sum of consecutive naturals, for example, 23684 + ... + 29955.

Almost surely, 2^168211904 is an apocalyptic number.

168211904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

168211904 is an abundant number, since it is smaller than the sum of its proper divisors (220088056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

168211904 is an equidigital number, since it uses as much as digits as its factorization.

168211904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53665 (or 53648 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 168211904 is about 12969.6531950550. The cubic root of 168211904 is about 552.0167326721.

The spelling of 168211904 in words is "one hundred sixty-eight million, two hundred eleven thousand, nine hundred four".