8440424 has 16 divisors (see below), whose sum is σ = 16212420. Its totient is φ = 4117120.

The previous prime is 8440423. The next prime is 8440429. The reversal of 8440424 is 4240448.

It can be written as a sum of positive squares in 2 ways, for example, as 6160324 + 2280100 = 2482^2 + 1510^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8440393 and 8440402.

It is not an unprimeable number, because it can be changed into a prime (8440423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12539 + ... + 13194.

Almost surely, 2^8440424 is an apocalyptic number.

It is an amenable number.

8440424 is a deficient number, since it is larger than the sum of its proper divisors (7771996).

8440424 is a wasteful number, since it uses less digits than its factorization.

8440424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25780 (or 25776 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 26.

The square root of 8440424 is about 2905.2407817597. The cubic root of 8440424 is about 203.6048354385.

The spelling of 8440424 in words is "eight million, four hundred forty thousand, four hundred twenty-four".