168538406 has 8 divisors (see below), whose sum is σ = 253225920. Its totient is φ = 84129768.

The previous prime is 168538387. The next prime is 168538507. The reversal of 168538406 is 604835861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68201 + ... + 70628.

It is an arithmetic number, because the mean of its divisors is an integer number (31653240).

Almost surely, 2^168538406 is an apocalyptic number.

168538406 is a deficient number, since it is larger than the sum of its proper divisors (84687514).

168538406 is a wasteful number, since it uses less digits than its factorization.

168538406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139438.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 168538406 is about 12982.2342453062. The cubic root of 168538406 is about 552.3736596113.

The spelling of 168538406 in words is "one hundred sixty-eight million, five hundred thirty-eight thousand, four hundred six".