159921620 has 12 divisors (see below), whose sum is σ = 335835444. Its totient is φ = 63968640.

The previous prime is 159921577. The next prime is 159921637. The reversal of 159921620 is 26129951.

It can be written as a sum of positive squares in 2 ways, for example, as 117983044 + 41938576 = 10862^2 + 6476^2 .

It is a congruent number.

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, 3998021 + ... + 3998060.

It is an arithmetic number, because the mean of its divisors is an integer number (27986287).

Almost surely, 2^159921620 is an apocalyptic number.

159921620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

159921620 is an abundant number, since it is smaller than the sum of its proper divisors (175913824).

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

159921620 is a wasteful number, since it uses less digits than its factorization.

159921620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7996090 (or 7996088 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 159921620 is about 12646.0120196052. The cubic root of 159921620 is about 542.7948604842.

The spelling of 159921620 in words is "one hundred fifty-nine million, nine hundred twenty-one thousand, six hundred twenty".