18701330 has 16 divisors (see below), whose sum is σ = 34484184. Its totient is φ = 7297920.

The previous prime is 18701297. The next prime is 18701341. The reversal of 18701330 is 3310781.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4541161 + 14160169 = 2131^2 + 3763^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18701296 and 18701305.

It is an unprimeable number.

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, 22397 + ... + 23216.

Almost surely, 2^18701330 is an apocalyptic number.

18701330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18701330 is a deficient number, since it is larger than the sum of its proper divisors (15782854).

18701330 is a wasteful number, since it uses less digits than its factorization.

18701330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45661.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 18701330 is about 4324.5034397026. The cubic root of 18701330 is about 265.4345782632.

The spelling of 18701330 in words is "eighteen million, seven hundred one thousand, three hundred thirty".