168428394 has 24 divisors (see below), whose sum is σ = 376701312. Its totient is φ = 54331560.

The previous prime is 168428387. The next prime is 168428417. The reversal of 168428394 is 493824861.

It is a happy number.

It is a super-3 number, since 3×168428394³ (a number of 26 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 150364 + ... + 151479.

It is an arithmetic number, because the mean of its divisors is an integer number (15695888).

Almost surely, 2^168428394 is an apocalyptic number.

168428394 is an abundant number, since it is smaller than the sum of its proper divisors (208272918).

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

168428394 is a wasteful number, since it uses less digits than its factorization.

168428394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301882 (or 301879 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 168428394 is about 12977.9965325932. The cubic root of 168428394 is about 552.2534477278.

The spelling of 168428394 in words is "one hundred sixty-eight million, four hundred twenty-eight thousand, three hundred ninety-four".