168999404 has 48 divisors (see below), whose sum is σ = 351848448. Its totient is φ = 69521088.

The previous prime is 168999403. The next prime is 168999409. The reversal of 168999404 is 404999861.

It is a happy number.

168999404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (168999403) 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, 68537 + ... + 70959.

It is an arithmetic number, because the mean of its divisors is an integer number (7330176).

Almost surely, 2^168999404 is an apocalyptic number.

168999404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 168999404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175924224).

168999404 is an abundant number, since it is smaller than the sum of its proper divisors (182849044).

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

168999404 is a wasteful number, since it uses less digits than its factorization.

168999404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2534 (or 2532 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 168999404 is about 12999.9770769029. The cubic root of 168999404 is about 552.8768314362.

The spelling of 168999404 in words is "one hundred sixty-eight million, nine hundred ninety-nine thousand, four hundred four".