18728038 has 16 divisors (see below), whose sum is σ = 32205600. Its totient is φ = 8001216.

The previous prime is 18728023. The next prime is 18728051. The reversal of 18728038 is 83082781.

It is a junction number, because it is equal to n+sod(n) for n = 18727988 and 18728006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2970 + ... + 6802.

It is an arithmetic number, because the mean of its divisors is an integer number (2012850).

Almost surely, 2^18728038 is an apocalyptic number.

18728038 is a deficient number, since it is larger than the sum of its proper divisors (13477562).

18728038 is a wasteful number, since it uses less digits than its factorization.

18728038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4191.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 18728038 is about 4327.5903225698. The cubic root of 18728038 is about 265.5608768492.

The spelling of 18728038 in words is "eighteen million, seven hundred twenty-eight thousand, thirty-eight".