163806947 has 4 divisors (see below), whose sum is σ = 165256680. Its totient is φ = 162357216.

The previous prime is 163806919. The next prime is 163806949. The reversal of 163806947 is 749608361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 749608361 = 1471 ⋅509591.

It is a cyclic number.

It is not a de Polignac number, because 163806947 - 2⁸ = 163806691 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 163806898 and 163806907.

It is not an unprimeable number, because it can be changed into a prime (163806949) 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, 724697 + ... + 724922.

It is an arithmetic number, because the mean of its divisors is an integer number (41314170).

Almost surely, 2^163806947 is an apocalyptic number.

163806947 is a deficient number, since it is larger than the sum of its proper divisors (1449733).

163806947 is a wasteful number, since it uses less digits than its factorization.

163806947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449732.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 163806947 is about 12798.7088020628. The cubic root of 163806947 is about 547.1555036943.

The spelling of 163806947 in words is "one hundred sixty-three million, eight hundred six thousand, nine hundred forty-seven".