18513424 has 20 divisors (see below), whose sum is σ = 36275580. Its totient is φ = 9152000.

The previous prime is 18513409. The next prime is 18513437. The reversal of 18513424 is 42431581.

It can be written as a sum of positive squares in 2 ways, for example, as 1440000 + 17073424 = 1200^2 + 4132^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18513392 and 18513401.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5077 + ... + 7924.

It is an arithmetic number, because the mean of its divisors is an integer number (1813779).

Almost surely, 2^18513424 is an apocalyptic number.

It is an amenable number.

18513424 is a deficient number, since it is larger than the sum of its proper divisors (17762156).

18513424 is a wasteful number, since it uses less digits than its factorization.

18513424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13098 (or 13092 counting only the distinct ones).

The product of its digits is 3840, while the sum is 28.

The square root of 18513424 is about 4302.7228588418. The cubic root of 18513424 is about 264.5425786374.

The spelling of 18513424 in words is "eighteen million, five hundred thirteen thousand, four hundred twenty-four".