8161540 has 12 divisors (see below), whose sum is σ = 17139276. Its totient is φ = 3264608.

The previous prime is 8161537. The next prime is 8161579. The reversal of 8161540 is 451618.

8161540 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1597696 + 6563844 = 1264^2 + 2562^2 .

It is a super-2 number, since 2×8161540² = 133221470343200, which contains 22 as substring.

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, 204019 + ... + 204058.

It is an arithmetic number, because the mean of its divisors is an integer number (1428273).

Almost surely, 2^8161540 is an apocalyptic number.

It is an amenable number.

8161540 is an abundant number, since it is smaller than the sum of its proper divisors (8977736).

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

8161540 is a wasteful number, since it uses less digits than its factorization.

8161540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408086 (or 408084 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 8161540 is about 2856.8409126166. The cubic root of 8161540 is about 201.3372061397.

The spelling of 8161540 in words is "eight million, one hundred sixty-one thousand, five hundred forty".