18209027930 has 48 divisors (see below), whose sum is σ = 35668024056. Its totient is φ = 6669803520.

The previous prime is 18209027899. The next prime is 18209027959. The reversal of 18209027930 is 3972090281.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 16351504129 + 1857523801 = 127873^2 + 43099^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 193610 + ... + 271850.

Almost surely, 2^18209027930 is an apocalyptic number.

18209027930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18209027930 is a deficient number, since it is larger than the sum of its proper divisors (17458996126).

18209027930 is a wasteful number, since it uses less digits than its factorization.

18209027930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78339 (or 78302 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The spelling of 18209027930 in words is "eighteen billion, two hundred nine million, twenty-seven thousand, nine hundred thirty".