7978392 has 64 divisors (see below), whose sum is σ = 22704000. Its totient is φ = 2594592.

The previous prime is 7978381. The next prime is 7978403. The reversal of 7978392 is 2938797.

It is an interprime number because it is at equal distance from previous prime (7978381) and next prime (7978403).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8859 + ... + 9717.

It is an arithmetic number, because the mean of its divisors is an integer number (354750).

Almost surely, 2^7978392 is an apocalyptic number.

7978392 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7978392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11352000).

7978392 is an abundant number, since it is smaller than the sum of its proper divisors (14725608).

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

7978392 is a wasteful number, since it uses less digits than its factorization.

7978392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917 (or 907 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 7978392 is about 2824.6047511112. The cubic root of 7978392 is about 199.8197709696.

The spelling of 7978392 in words is "seven million, nine hundred seventy-eight thousand, three hundred ninety-two".