7427440 has 40 divisors (see below), whose sum is σ = 17387280. Its totient is φ = 2950656.

The previous prime is 7427353. The next prime is 7427443. The reversal of 7427440 is 447247.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 7427399 and 7427408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7427443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17956 + ... + 18364.

It is an arithmetic number, because the mean of its divisors is an integer number (434682).

Almost surely, 2^7427440 is an apocalyptic number.

It is an amenable number.

7427440 is an abundant number, since it is smaller than the sum of its proper divisors (9959840).

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

7427440 is a wasteful number, since it uses less digits than its factorization.

7427440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649 (or 643 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 28.

The square root of 7427440 is about 2725.3330071755. Note that the first 3 decimals coincide. The cubic root of 7427440 is about 195.1100846747.

The spelling of 7427440 in words is "seven million, four hundred twenty-seven thousand, four hundred forty".