7869440 has 88 divisors (see below), whose sum is σ = 19896840. Its totient is φ = 2981888.

The previous prime is 7869431. The next prime is 7869451. The reversal of 7869440 is 449687.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1478656 + 6390784 = 1216^2 + 2528^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7869394 and 7869403.

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, 148454 + ... + 148506.

Almost surely, 2^7869440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7869440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9948420).

7869440 is an abundant number, since it is smaller than the sum of its proper divisors (12027400).

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

7869440 is a wasteful number, since it uses less digits than its factorization.

7869440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 7869440 is about 2805.2522168247. The cubic root of 7869440 is about 198.9060270260.

The spelling of 7869440 in words is "seven million, eight hundred sixty-nine thousand, four hundred forty".