8159940 has 144 divisors (see below), whose sum is σ = 27151488. Its totient is φ = 2052864.

The previous prime is 8159939. The next prime is 8159941. The reversal of 8159940 is 499518.

It is an interprime number because it is at equal distance from previous prime (8159939) and next prime (8159941).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 8159895 and 8159904.

It is not an unprimeable number, because it can be changed into a prime (8159941) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 111744 + ... + 111816.

It is an arithmetic number, because the mean of its divisors is an integer number (188552).

Almost surely, 2^8159940 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8159940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13575744).

8159940 is an abundant number, since it is smaller than the sum of its proper divisors (18991548).

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

8159940 is a wasteful number, since it uses less digits than its factorization.

8159940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 8159940 is about 2856.5608692972. The cubic root of 8159940 is about 201.3240484683.

The spelling of 8159940 in words is "eight million, one hundred fifty-nine thousand, nine hundred forty".