18430525 has 12 divisors (see below), whose sum is σ = 23412564. Its totient is φ = 14384000.

The previous prime is 18430519. The next prime is 18430541. The reversal of 18430525 is 52503481.

18430525 = 433² + 434² + ... + 514².

It can be written as a sum of positive squares in 6 ways, for example, as 86436 + 18344089 = 294^2 + 4283^2 .

It is not a de Polignac number, because 18430525 - 2⁵ = 18430493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18430493 and 18430502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7966 + ... + 10015.

It is an arithmetic number, because the mean of its divisors is an integer number (1951047).

Almost surely, 2^18430525 is an apocalyptic number.

It is an amenable number.

18430525 is a deficient number, since it is larger than the sum of its proper divisors (4982039).

18430525 is a wasteful number, since it uses less digits than its factorization.

18430525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18032 (or 18027 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 18430525 is about 4293.0787320989. The cubic root of 18430525 is about 264.1471335102.

The spelling of 18430525 in words is "eighteen million, four hundred thirty thousand, five hundred twenty-five".