18403072 has 18 divisors (see below), whose sum is σ = 36734768. Its totient is φ = 9201408.

The previous prime is 18403043. The next prime is 18403079. The reversal of 18403072 is 27030481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18403079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35688 + ... + 36199.

Almost surely, 2^18403072 is an apocalyptic number.

It is an amenable number.

18403072 is a deficient number, since it is larger than the sum of its proper divisors (18331696).

18403072 is an frugal number, since it uses more digits than its factorization.

18403072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71903 (or 71889 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 18403072 is about 4289.8801848070. The cubic root of 18403072 is about 264.0159157837.

The spelling of 18403072 in words is "eighteen million, four hundred three thousand, seventy-two".