18728743 has 12 divisors (see below), whose sum is σ = 21254464. Its totient is φ = 16473600.

The previous prime is 18728741. The next prime is 18728753. The reversal of 18728743 is 34782781.

It is not a de Polignac number, because 18728743 - 2¹ = 18728741 is a prime.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 18728696 and 18728705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18728741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1255 + ... + 6247.

Almost surely, 2^18728743 is an apocalyptic number.

18728743 is a deficient number, since it is larger than the sum of its proper divisors (2525721).

18728743 is a wasteful number, since it uses less digits than its factorization.

18728743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5046 (or 5035 counting only the distinct ones).

The product of its digits is 75264, while the sum is 40.

The square root of 18728743 is about 4327.6717759091. The cubic root of 18728743 is about 265.5642090735.

The spelling of 18728743 in words is "eighteen million, seven hundred twenty-eight thousand, seven hundred forty-three".