159999840 has 768 divisors, whose sum is σ = 772208640. Its totient is φ = 29859840.

The previous prime is 159999811. The next prime is 159999871. The reversal of 159999840 is 48999951.

159999840 is a `hidden beast` number, since 1 + 599 + 9 + 9 + 8 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4324302 + ... + 4324338.

It is an arithmetic number, because the mean of its divisors is an integer number (1005480).

Almost surely, 2^159999840 is an apocalyptic number.

159999840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 159999840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (386104320).

159999840 is an abundant number, since it is smaller than the sum of its proper divisors (612208800).

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

159999840 is a wasteful number, since it uses less digits than its factorization.

159999840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 54.

The square root of 159999840 is about 12649.1043161166. The cubic root of 159999840 is about 542.8833423577.

It can be divided in two parts, 159 and 999840, that added together give a palindrome (999999).

The spelling of 159999840 in words is "one hundred fifty-nine million, nine hundred ninety-nine thousand, eight hundred forty".