159621640 has 16 divisors (see below), whose sum is σ = 359148780. Its totient is φ = 63848640.

The previous prime is 159621629. The next prime is 159621661. The reversal of 159621640 is 46126951.

It can be written as a sum of positive squares in 2 ways, for example, as 140138244 + 19483396 = 11838^2 + 4414^2 .

It is a junction number, because it is equal to n+sod(n) for n = 159621596 and 159621605.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1995231 + ... + 1995310.

Almost surely, 2^159621640 is an apocalyptic number.

159621640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

159621640 is an abundant number, since it is smaller than the sum of its proper divisors (199527140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

159621640 is a wasteful number, since it uses less digits than its factorization.

159621640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3990552 (or 3990548 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 159621640 is about 12634.1457962143. The cubic root of 159621640 is about 542.4552576237.

The spelling of 159621640 in words is "one hundred fifty-nine million, six hundred twenty-one thousand, six hundred forty".