8145540 has 108 divisors (see below), whose sum is σ = 27067404. Its totient is φ = 1971072.

The previous prime is 8145479. The next prime is 8145541. The reversal of 8145540 is 455418.

8145540 = T₃₁₁ + T₃₁₂ + ... + T₄₂₈.

8145540 is a `hidden beast` number, since 81 + 45 + 540 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2005056 + 6140484 = 1416^2 + 2478^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8145541) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 138031 + ... + 138089.

Almost surely, 2^8145540 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 8145540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13533702).

8145540 is an abundant number, since it is smaller than the sum of its proper divisors (18921864).

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

8145540 is a wasteful number, since it uses less digits than its factorization.

8145540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 8145540 is about 2854.0392428977. The cubic root of 8145540 is about 201.2055519550.

The spelling of 8145540 in words is "eight million, one hundred forty-five thousand, five hundred forty".