18040525 has 6 divisors (see below), whose sum is σ = 22370282. Its totient is φ = 14432400.

The previous prime is 18040513. The next prime is 18040531. The reversal of 18040525 is 52504081.

It can be written as a sum of positive squares in 3 ways, for example, as 249001 + 17791524 = 499^2 + 4218^2 .

It is not a de Polignac number, because 18040525 - 2⁷ = 18040397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 721621 = 18040525 / (1 + 8 + 0 + 4 + 0 + 5 + 2 + 5).

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 18040525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 360786 + ... + 360835.

Almost surely, 2^18040525 is an apocalyptic number.

It is an amenable number.

18040525 is a deficient number, since it is larger than the sum of its proper divisors (4329757).

18040525 is an equidigital number, since it uses as much as digits as its factorization.

18040525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721631 (or 721626 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 18040525 is about 4247.4139190806. The cubic root of 18040525 is about 262.2706689417.

The spelling of 18040525 in words is "eighteen million, forty thousand, five hundred twenty-five".