18942729 has 16 divisors (see below), whose sum is σ = 27586944. Its totient is φ = 11491200.

The previous prime is 18942691. The next prime is 18942733. The reversal of 18942729 is 92724981.

It is not a de Polignac number, because 18942729 - 2¹³ = 18934537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18942769) 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, 652 + ... + 6189.

It is an arithmetic number, because the mean of its divisors is an integer number (1724184).

Almost surely, 2^18942729 is an apocalyptic number.

It is an amenable number.

18942729 is a deficient number, since it is larger than the sum of its proper divisors (8644215).

18942729 is a wasteful number, since it uses less digits than its factorization.

18942729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6928.

The product of its digits is 72576, while the sum is 42.

The square root of 18942729 is about 4352.3245513174. The cubic root of 18942729 is about 266.5717862107.

The spelling of 18942729 in words is "eighteen million, nine hundred forty-two thousand, seven hundred twenty-nine".