163870639 has 4 divisors (see below), whose sum is σ = 163933000. Its totient is φ = 163808280.

The previous prime is 163870613. The next prime is 163870657. The reversal of 163870639 is 936078361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936078361 = 17 ⋅55063433.

It is a cyclic number.

It is not a de Polignac number, because 163870639 - 2¹¹ = 163868591 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 163870595 and 163870604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163870739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27057 + ... + 32554.

It is an arithmetic number, because the mean of its divisors is an integer number (40983250).

Almost surely, 2^163870639 is an apocalyptic number.

163870639 is a deficient number, since it is larger than the sum of its proper divisors (62361).

163870639 is an equidigital number, since it uses as much as digits as its factorization.

163870639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62360.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 163870639 is about 12801.1967799890. The cubic root of 163870639 is about 547.2264101550.

The spelling of 163870639 in words is "one hundred sixty-three million, eight hundred seventy thousand, six hundred thirty-nine".