18927430929 has 45 divisors (see below), whose sum is σ = 30152956665. Its totient is φ = 11440903320.

The previous prime is 18927430909. The next prime is 18927430939. The reversal of 18927430929 is 92903472981.

The square root of 18927430929 is 137577.

It is a perfect power (a square), and thus also a powerful number.

18927430929 is a `hidden beast` number, since 189 + 2 + 7 + 430 + 9 + 29 = 666.

It is not a de Polignac number, because 18927430929 - 2⁷ = 18927430801 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18927430909) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 49940262 + ... + 49940640.

Almost surely, 2^18927430929 is an apocalyptic number.

18927430929 is the 137577-th square number.

18927430929 is the 68789-th centered octagonal number.

It is an amenable number.

18927430929 is a deficient number, since it is larger than the sum of its proper divisors (11225525736).

18927430929 is an frugal number, since it uses more digits than its factorization.

18927430929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 18927430929 in words is "eighteen billion, nine hundred twenty-seven million, four hundred thirty thousand, nine hundred twenty-nine".