18750729 has 16 divisors (see below), whose sum is σ = 25752320. Its totient is φ = 12130560.

The previous prime is 18750713. The next prime is 18750757. The reversal of 18750729 is 92705781.

It is not a de Polignac number, because 18750729 - 2⁴ = 18750713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18750029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13809 + ... + 15105.

It is an arithmetic number, because the mean of its divisors is an integer number (1609520).

Almost surely, 2^18750729 is an apocalyptic number.

It is an amenable number.

18750729 is a deficient number, since it is larger than the sum of its proper divisors (7001591).

18750729 is a wasteful number, since it uses less digits than its factorization.

18750729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1440.

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 18750729 is about 4330.2111957733. The cubic root of 18750729 is about 265.6680852648.

The spelling of 18750729 in words is "eighteen million, seven hundred fifty thousand, seven hundred twenty-nine".