7918140 has 24 divisors (see below), whose sum is σ = 22170960. Its totient is φ = 2111488.

The previous prime is 7918139. The next prime is 7918153. The reversal of 7918140 is 418197.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 7918098 and 7918107.

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, 65925 + ... + 66044.

It is an arithmetic number, because the mean of its divisors is an integer number (923790).

Almost surely, 2^7918140 is an apocalyptic number.

It is an amenable number.

7918140 is an abundant number, since it is smaller than the sum of its proper divisors (14252820).

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

7918140 is a wasteful number, since it uses less digits than its factorization.

7918140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131981 (or 131979 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 7918140 is about 2813.9189753794. The cubic root of 7918140 is about 199.3154932586.

The spelling of 7918140 in words is "seven million, nine hundred eighteen thousand, one hundred forty".