163940999 has 8 divisors (see below), whose sum is σ = 167752320. Its totient is φ = 160164216.

The previous prime is 163940993. The next prime is 163941023. The reversal of 163940999 is 999049361.

It is a happy number.

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 163940999 - 2⁸ = 163940743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163940993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1094 + ... + 18140.

It is an arithmetic number, because the mean of its divisors is an integer number (20969040).

Almost surely, 2^163940999 is an apocalyptic number.

163940999 is a deficient number, since it is larger than the sum of its proper divisors (3811321).

163940999 is a wasteful number, since it uses less digits than its factorization.

163940999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17269.

The product of its (nonzero) digits is 472392, while the sum is 50.

The square root of 163940999 is about 12803.9446656099. The cubic root of 163940999 is about 547.3047185516.

The spelling of 163940999 in words is "one hundred sixty-three million, nine hundred forty thousand, nine hundred ninety-nine".