163849405 has 4 divisors (see below), whose sum is σ = 196619292. Its totient is φ = 131079520.

The previous prime is 163849403. The next prime is 163849423. The reversal of 163849405 is 504948361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504948361 = 37 ⋅13647253.

It can be written as a sum of positive squares in 2 ways, for example, as 74338884 + 89510521 = 8622^2 + 9461^2 .

It is not a de Polignac number, because 163849405 - 2¹ = 163849403 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 (163849403) 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 3 ways as a sum of consecutive naturals, for example, 16384936 + ... + 16384945.

It is an arithmetic number, because the mean of its divisors is an integer number (49154823).

Almost surely, 2^163849405 is an apocalyptic number.

It is an amenable number.

163849405 is a deficient number, since it is larger than the sum of its proper divisors (32769887).

163849405 is an equidigital number, since it uses as much as digits as its factorization.

163849405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32769886.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 163849405 is about 12800.3673775404. The cubic root of 163849405 is about 547.2027729991.

The spelling of 163849405 in words is "one hundred sixty-three million, eight hundred forty-nine thousand, four hundred five".