159978421 has 4 divisors (see below), whose sum is σ = 160006144. Its totient is φ = 159950700.

The previous prime is 159978391. The next prime is 159978437. The reversal of 159978421 is 124879951.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 159978421 - 2¹¹ = 159976373 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 (159978521) 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, 1575 + ... + 17956.

It is an arithmetic number, because the mean of its divisors is an integer number (40001536).

Almost surely, 2^159978421 is an apocalyptic number.

It is an amenable number.

159978421 is a deficient number, since it is larger than the sum of its proper divisors (27723).

159978421 is an equidigital number, since it uses as much as digits as its factorization.

159978421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27722.

The product of its digits is 181440, while the sum is 46.

The square root of 159978421 is about 12648.2576270410. The cubic root of 159978421 is about 542.8591162143.

The spelling of 159978421 in words is "one hundred fifty-nine million, nine hundred seventy-eight thousand, four hundred twenty-one".