168993493 has 8 divisors (see below), whose sum is σ = 175458816. Its totient is φ = 162591600.

The previous prime is 168993463. The next prime is 168993509. The reversal of 168993493 is 394399861.

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

It is a cyclic number.

It is not a de Polignac number, because 168993493 - 2⁹ = 168992981 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 168993493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168993463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10393 + ... + 21118.

It is an arithmetic number, because the mean of its divisors is an integer number (21932352).

Almost surely, 2^168993493 is an apocalyptic number.

It is an amenable number.

168993493 is a deficient number, since it is larger than the sum of its proper divisors (6465323).

168993493 is a wasteful number, since it uses less digits than its factorization.

168993493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31715.

The product of its digits is 1259712, while the sum is 52.

The square root of 168993493 is about 12999.7497283602. The cubic root of 168993493 is about 552.8703854706.

The spelling of 168993493 in words is "one hundred sixty-eight million, nine hundred ninety-three thousand, four hundred ninety-three".