159721423 has 8 divisors (see below), whose sum is σ = 161395200. Its totient is φ = 158054400.

The previous prime is 159721399. The next prime is 159721469. The reversal of 159721423 is 324127951.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 159721423 - 2¹⁷ = 159590351 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 (159724423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55623 + ... + 58423.

It is an arithmetic number, because the mean of its divisors is an integer number (20174400).

Almost surely, 2^159721423 is an apocalyptic number.

159721423 is a deficient number, since it is larger than the sum of its proper divisors (1673777).

159721423 is a wasteful number, since it uses less digits than its factorization.

159721423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3377.

The product of its digits is 15120, while the sum is 34.

The square root of 159721423 is about 12638.0941205547. The cubic root of 159721423 is about 542.5682676518.

The spelling of 159721423 in words is "one hundred fifty-nine million, seven hundred twenty-one thousand, four hundred twenty-three".