18693428 has 18 divisors (see below), whose sum is σ = 35424774. Its totient is φ = 8627424.

The previous prime is 18693427. The next prime is 18693439. The reversal of 18693428 is 82439681.

It can be written as a sum of positive squares in 3 ways, for example, as 2226064 + 16467364 = 1492^2 + 4058^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18693427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13151 + ... + 14502.

It is an arithmetic number, because the mean of its divisors is an integer number (1968043).

Almost surely, 2^18693428 is an apocalyptic number.

It is an amenable number.

18693428 is a deficient number, since it is larger than the sum of its proper divisors (16731346).

18693428 is a wasteful number, since it uses less digits than its factorization.

18693428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27683 (or 27668 counting only the distinct ones).

The product of its digits is 82944, while the sum is 41.

The square root of 18693428 is about 4323.5897122646. The cubic root of 18693428 is about 265.3971877046.

The spelling of 18693428 in words is "eighteen million, six hundred ninety-three thousand, four hundred twenty-eight".