7938918 has 64 divisors (see below), whose sum is σ = 19514880. Its totient is φ = 2376864.

The previous prime is 7938907. The next prime is 7938919. The reversal of 7938918 is 8198397.

Its product of digits (108864) is a multiple of the sum of its prime divisors (324).

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7938919) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30055 + ... + 30317.

It is an arithmetic number, because the mean of its divisors is an integer number (304920).

Almost surely, 2^7938918 is an apocalyptic number.

7938918 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 7938918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9757440).

7938918 is an abundant number, since it is smaller than the sum of its proper divisors (11575962).

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

7938918 is a wasteful number, since it uses less digits than its factorization.

7938918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330 (or 324 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 7938918 is about 2817.6085604640. The cubic root of 7938918 is about 199.4896823202.

The spelling of 7938918 in words is "seven million, nine hundred thirty-eight thousand, nine hundred eighteen".