159721894 has 8 divisors (see below), whose sum is σ = 241909200. Its totient is φ = 79085496.

The previous prime is 159721873. The next prime is 159721897. The reversal of 159721894 is 498127951.

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

It is a super-2 number, since 2×159721894² = 51022166845894472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159721897) 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, 387469 + ... + 387880.

It is an arithmetic number, because the mean of its divisors is an integer number (30238650).

Almost surely, 2^159721894 is an apocalyptic number.

159721894 is a deficient number, since it is larger than the sum of its proper divisors (82187306).

159721894 is a wasteful number, since it uses less digits than its factorization.

159721894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775454.

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

The square root of 159721894 is about 12638.1127546798. The cubic root of 159721894 is about 542.5688009749.

The spelling of 159721894 in words is "one hundred fifty-nine million, seven hundred twenty-one thousand, eight hundred ninety-four".