7920009918 has 12 divisors (see below), whose sum is σ = 17160021528. Its totient is φ = 2640003300.

The previous prime is 7920009887. The next prime is 7920009943. The reversal of 7920009918 is 8199000297.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 220000258 + ... + 220000293.

It is an arithmetic number, because the mean of its divisors is an integer number (1430001794).

Almost surely, 2^7920009918 is an apocalyptic number.

7920009918 is an abundant number, since it is smaller than the sum of its proper divisors (9240011610).

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

7920009918 is a wasteful number, since it uses less digits than its factorization.

7920009918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440000559 (or 440000556 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 7920009918 is about 88994.4375677491. The cubic root of 7920009918 is about 1993.3118188812.

The spelling of 7920009918 in words is "seven billion, nine hundred twenty million, nine thousand, nine hundred eighteen".