18525397 has 4 divisors (see below), whose sum is σ = 20209536. Its totient is φ = 16841260.

The previous prime is 18525349. The next prime is 18525401. The reversal of 18525397 is 79352581.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18525397 - 2¹⁵ = 18492629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18525307) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 842053 + ... + 842074.

It is an arithmetic number, because the mean of its divisors is an integer number (5052384).

Almost surely, 2^18525397 is an apocalyptic number.

It is an amenable number.

18525397 is a deficient number, since it is larger than the sum of its proper divisors (1684139).

18525397 is a wasteful number, since it uses less digits than its factorization.

18525397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1684138.

The product of its digits is 75600, while the sum is 40.

The square root of 18525397 is about 4304.1139622459. The cubic root of 18525397 is about 264.5995946661.

The spelling of 18525397 in words is "eighteen million, five hundred twenty-five thousand, three hundred ninety-seven".