8161240 has 32 divisors (see below), whose sum is σ = 18445680. Its totient is φ = 3249792.

The previous prime is 8161213. The next prime is 8161243. The reversal of 8161240 is 421618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8161243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14647 + ... + 15193.

Almost surely, 2^8161240 is an apocalyptic number.

It is an amenable number.

8161240 is an abundant number, since it is smaller than the sum of its proper divisors (10284440).

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

8161240 is a wasteful number, since it uses less digits than its factorization.

8161240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931 (or 927 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 8161240 is about 2856.7884065853. The cubic root of 8161240 is about 201.3347392073.

Adding to 8161240 its reverse (421618), we get a palindrome (8582858).

The spelling of 8161240 in words is "eight million, one hundred sixty-one thousand, two hundred forty".