2640424 has 8 divisors (see below), whose sum is σ = 4950810. Its totient is φ = 1320208.

The previous prime is 2640409. The next prime is 2640497. The reversal of 2640424 is 4240462.

It can be written as a sum of positive squares in only one way, i.e., 2617924 + 22500 = 1618^2 + 150^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 2640395 and 2640404.

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 as a sum of consecutive naturals, namely, 165019 + ... + 165034.

2^2640424 is an apocalyptic number.

It is an amenable number.

2640424 is a deficient number, since it is larger than the sum of its proper divisors (2310386).

2640424 is a wasteful number, since it uses less digits than its factorization.

2640424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330059 (or 330055 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 2640424 is about 1624.9381526692. The cubic root of 2640424 is about 138.2158632432.

Adding to 2640424 its reverse (4240462), we get a palindrome (6880886).

The spelling of 2640424 in words is "two million, six hundred forty thousand, four hundred twenty-four".