8121465240 has 128 divisors (see below), whose sum is σ = 27903605760. Its totient is φ = 1852429824.

The previous prime is 8121465221. The next prime is 8121465259. The reversal of 8121465240 is 425641218.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (8121465221) and next prime (8121465259).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 399154 + ... + 419006.

It is an arithmetic number, because the mean of its divisors is an integer number (217996920).

Almost surely, 2^8121465240 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 8121465240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13951802880).

8121465240 is an abundant number, since it is smaller than the sum of its proper divisors (19782140520).

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

8121465240 is a wasteful number, since it uses less digits than its factorization.

8121465240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20361 (or 20357 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 8121465240 is about 90119.1724329512. The cubic root of 8121465240 is about 2010.0713026363.

The spelling of 8121465240 in words is "eight billion, one hundred twenty-one million, four hundred sixty-five thousand, two hundred forty".