163280389 has 4 divisors (see below), whose sum is σ = 163861740. Its totient is φ = 162699040.

The previous prime is 163280387. The next prime is 163280431. The reversal of 163280389 is 983082361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41177889 + 122102500 = 6417^2 + 11050^2 .

It is a cyclic number.

It is not a de Polignac number, because 163280389 - 2¹ = 163280387 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163280387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 290254 + ... + 290815.

It is an arithmetic number, because the mean of its divisors is an integer number (40965435).

Almost surely, 2^163280389 is an apocalyptic number.

It is an amenable number.

163280389 is a deficient number, since it is larger than the sum of its proper divisors (581351).

163280389 is an equidigital number, since it uses as much as digits as its factorization.

163280389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581350.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 163280389 is about 12778.1214973094. The cubic root of 163280389 is about 546.5685966171.

The spelling of 163280389 in words is "one hundred sixty-three million, two hundred eighty thousand, three hundred eighty-nine".