18203072 has 14 divisors (see below), whose sum is σ = 36121848. Its totient is φ = 9101504.

The previous prime is 18203063. The next prime is 18203077. The reversal of 18203072 is 27030281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18203077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142148 + ... + 142275.

It is an arithmetic number, because the mean of its divisors is an integer number (2580132).

Almost surely, 2^18203072 is an apocalyptic number.

It is an amenable number.

18203072 is a deficient number, since it is larger than the sum of its proper divisors (17918776).

18203072 is an equidigital number, since it uses as much as digits as its factorization.

18203072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284435 (or 284425 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 18203072 is about 4266.5058303019. The cubic root of 18203072 is about 263.0560102773.

The spelling of 18203072 in words is "eighteen million, two hundred three thousand, seventy-two".