18261530 has 16 divisors (see below), whose sum is σ = 37566720. Its totient is φ = 6261072.

The previous prime is 18261493. The next prime is 18261539. The reversal of 18261530 is 3516281.

It is a self number, because there is not a number n which added to its sum of digits gives 18261530.

It is not an unprimeable number, because it can be changed into a prime (18261539) 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, 130370 + ... + 130509.

It is an arithmetic number, because the mean of its divisors is an integer number (2347920).

Almost surely, 2^18261530 is an apocalyptic number.

18261530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18261530 is an abundant number, since it is smaller than the sum of its proper divisors (19305190).

18261530 is a wasteful number, since it uses less digits than its factorization.

18261530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260893.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 18261530 is about 4273.3511440086. The cubic root of 18261530 is about 263.3373052152.

The spelling of 18261530 in words is "eighteen million, two hundred sixty-one thousand, five hundred thirty".