8120397040 has 40 divisors (see below), whose sum is σ = 21577056480. Its totient is φ = 2784135936.

The previous prime is 8120397013. The next prime is 8120397053. The reversal of 8120397040 is 407930218.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 8120396987 and 8120397005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7249795 + ... + 7250914.

It is an arithmetic number, because the mean of its divisors is an integer number (539426412).

Almost surely, 2^8120397040 is an apocalyptic number.

8120397040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8120397040 is an abundant number, since it is smaller than the sum of its proper divisors (13456659440).

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

8120397040 is a wasteful number, since it uses less digits than its factorization.

8120397040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14500729 (or 14500723 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 8120397040 is about 90113.2456412485. The cubic root of 8120397040 is about 2009.9831718928.

The spelling of 8120397040 in words is "eight billion, one hundred twenty million, three hundred ninety-seven thousand, forty".