18730447 has 16 divisors (see below), whose sum is σ = 21116160. Its totient is φ = 16509312.

The previous prime is 18730429. The next prime is 18730469. The reversal of 18730447 is 74403781.

It is not a de Polignac number, because 18730447 - 2¹¹ = 18728399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18739447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32988 + ... + 33550.

It is an arithmetic number, because the mean of its divisors is an integer number (1319760).

Almost surely, 2^18730447 is an apocalyptic number.

18730447 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

18730447 is a deficient number, since it is larger than the sum of its proper divisors (2385713).

18730447 is a wasteful number, since it uses less digits than its factorization.

18730447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 18730447 is about 4327.8686440325. The cubic root of 18730447 is about 265.5722627851.

The spelling of 18730447 in words is "eighteen million, seven hundred thirty thousand, four hundred forty-seven".