163873939 has 4 divisors (see below), whose sum is σ = 163923760. Its totient is φ = 163824120.

The previous prime is 163873909. The next prime is 163873951. The reversal of 163873939 is 939378361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 939378361 = 97 ⋅9684313.

It is a cyclic number.

It is not a de Polignac number, because 163873939 - 2⁵ = 163873907 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 163873892 and 163873901.

It is not an unprimeable number, because it can be changed into a prime (163873909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19599 + ... + 26680.

It is an arithmetic number, because the mean of its divisors is an integer number (40980940).

Almost surely, 2^163873939 is an apocalyptic number.

163873939 is a deficient number, since it is larger than the sum of its proper divisors (49821).

163873939 is an equidigital number, since it uses as much as digits as its factorization.

163873939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49820.

The product of its digits is 734832, while the sum is 49.

The square root of 163873939 is about 12801.3256735387. The cubic root of 163873939 is about 547.2300834488.

The spelling of 163873939 in words is "one hundred sixty-three million, eight hundred seventy-three thousand, nine hundred thirty-nine".