18433930 has 16 divisors (see below), whose sum is σ = 33808104. Its totient is φ = 7234240.

The previous prime is 18433907. The next prime is 18433931. The reversal of 18433930 is 3933481.

It can be written as a sum of positive squares in 4 ways, for example, as 15233409 + 3200521 = 3903^2 + 1789^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18433892 and 18433901.

It is not an unprimeable number, because it can be changed into a prime (18433931) 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 7 ways as a sum of consecutive naturals, for example, 16861 + ... + 17920.

Almost surely, 2^18433930 is an apocalyptic number.

18433930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18433930 is a deficient number, since it is larger than the sum of its proper divisors (15374174).

18433930 is a wasteful number, since it uses less digits than its factorization.

18433930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34841.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 18433930 is about 4293.4752823325. The cubic root of 18433930 is about 264.1633993809.

The spelling of 18433930 in words is "eighteen million, four hundred thirty-three thousand, nine hundred thirty".