159978309 has 16 divisors (see below), whose sum is σ = 226030080. Its totient is φ = 100364400.

The previous prime is 159978283. The next prime is 159978331. The reversal of 159978309 is 903879951.

It is a happy number.

It is not a de Polignac number, because 159978309 - 2¹¹ = 159976261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159978359) 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 15 ways as a sum of consecutive naturals, for example, 687 + ... + 17900.

It is an arithmetic number, because the mean of its divisors is an integer number (14126880).

Almost surely, 2^159978309 is an apocalyptic number.

159978309 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

159978309 is a deficient number, since it is larger than the sum of its proper divisors (66051771).

159978309 is a wasteful number, since it uses less digits than its factorization.

159978309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18760.

The product of its (nonzero) digits is 612360, while the sum is 51.

The square root of 159978309 is about 12648.2531995529. The cubic root of 159978309 is about 542.8589895301.

The spelling of 159978309 in words is "one hundred fifty-nine million, nine hundred seventy-eight thousand, three hundred nine".