18281930 has 8 divisors (see below), whose sum is σ = 32907492. Its totient is φ = 7312768.

The previous prime is 18281929. The next prime is 18281969. The reversal of 18281930 is 3918281.

It can be written as a sum of positive squares in 2 ways, for example, as 16589329 + 1692601 = 4073^2 + 1301^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 914087 + ... + 914106.

Almost surely, 2^18281930 is an apocalyptic number.

18281930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18281930 is a deficient number, since it is larger than the sum of its proper divisors (14625562).

18281930 is a wasteful number, since it uses less digits than its factorization.

18281930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828200.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 18281930 is about 4275.7373633094. The cubic root of 18281930 is about 263.4353269743.

The spelling of 18281930 in words is "eighteen million, two hundred eighty-one thousand, nine hundred thirty".