7993440 has 288 divisors, whose sum is σ = 34122816. Its totient is φ = 1658880.

The previous prime is 7993439. The next prime is 7993459. The reversal of 7993440 is 443997.

7993440 is nontrivially palindromic in base 11.

7993440 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 7993395 and 7993404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 131010 + ... + 131070.

It is an arithmetic number, because the mean of its divisors is an integer number (118482).

Almost surely, 2^7993440 is an apocalyptic number.

7993440 is a gapful number since it is divisible by the number (70) 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 7993440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17061408).

7993440 is an abundant number, since it is smaller than the sum of its proper divisors (26129376).

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

7993440 is a wasteful number, since it uses less digits than its factorization.

7993440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 7993440 is about 2827.2672317982. The cubic root of 7993440 is about 199.9453183843.

The spelling of 7993440 in words is "seven million, nine hundred ninety-three thousand, four hundred forty".