18738530 has 16 divisors (see below), whose sum is σ = 34065144. Its totient is φ = 7420800.

The previous prime is 18738527. The next prime is 18738547. The reversal of 18738530 is 3583781.

It can be written as a sum of positive squares in 4 ways, for example, as 15437041 + 3301489 = 3929^2 + 1817^2 .

It is a super-2 number, since 2×18738530² = 702265013121800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8267 + ... + 10286.

Almost surely, 2^18738530 is an apocalyptic number.

18738530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18738530 is a deficient number, since it is larger than the sum of its proper divisors (15326614).

18738530 is a wasteful number, since it uses less digits than its factorization.

18738530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18661.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 18738530 is about 4328.8023747914. The cubic root of 18738530 is about 265.6104592732.

The spelling of 18738530 in words is "eighteen million, seven hundred thirty-eight thousand, five hundred thirty".