18012530 has 16 divisors (see below), whose sum is σ = 33214104. Its totient is φ = 7029120.

The previous prime is 18012499. The next prime is 18012541. The reversal of 18012530 is 3521081.

It can be written as a sum of positive squares in 4 ways, for example, as 4609609 + 13402921 = 2147^2 + 3661^2 .

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, 21557 + ... + 22376.

Almost surely, 2^18012530 is an apocalyptic number.

18012530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18012530 is a deficient number, since it is larger than the sum of its proper divisors (15201574).

18012530 is a wasteful number, since it uses less digits than its factorization.

18012530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43981.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 18012530 is about 4244.1171048877. The cubic root of 18012530 is about 262.1349362228.

The spelling of 18012530 in words is "eighteen million, twelve thousand, five hundred thirty".