7898240 has 128 divisors (see below), whose sum is σ = 22619520. Its totient is φ = 2580480.

The previous prime is 7898239. The next prime is 7898263. The reversal of 7898240 is 428987.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 7898194 and 7898203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183659 + ... + 183701.

It is an arithmetic number, because the mean of its divisors is an integer number (176715).

Almost surely, 2^7898240 is an apocalyptic number.

7898240 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 7898240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11309760).

7898240 is an abundant number, since it is smaller than the sum of its proper divisors (14721280).

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

7898240 is a wasteful number, since it uses less digits than its factorization.

7898240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 7898240 is about 2810.3807571217. The cubic root of 7898240 is about 199.1483788542.

The spelling of 7898240 in words is "seven million, eight hundred ninety-eight thousand, two hundred forty".