168998401 has 16 divisors (see below), whose sum is σ = 200204928. Its totient is φ = 141802320.

The previous prime is 168998381. The next prime is 168998413. The reversal of 168998401 is 104899861.

It is not a de Polignac number, because 168998401 - 2¹³ = 168990209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (168998441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12420 + ... + 22186.

It is an arithmetic number, because the mean of its divisors is an integer number (12512808).

Almost surely, 2^168998401 is an apocalyptic number.

168998401 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

168998401 is a deficient number, since it is larger than the sum of its proper divisors (31206527).

168998401 is an equidigital number, since it uses as much as digits as its factorization.

168998401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9813 (or 9791 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 168998401 is about 12999.9384998545. The cubic root of 168998401 is about 552.8757376719.

The spelling of 168998401 in words is "one hundred sixty-eight million, nine hundred ninety-eight thousand, four hundred one".