18825537 has 4 divisors (see below), whose sum is σ = 25100720. Its totient is φ = 12550356.

The previous prime is 18825509. The next prime is 18825539. The reversal of 18825537 is 73552881.

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 not a de Polignac number, because 18825537 - 2¹⁰ = 18824513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18825495 and 18825504.

It is not an unprimeable number, because it can be changed into a prime (18825539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3137587 + ... + 3137592.

It is an arithmetic number, because the mean of its divisors is an integer number (6275180).

Almost surely, 2^18825537 is an apocalyptic number.

It is an amenable number.

18825537 is a deficient number, since it is larger than the sum of its proper divisors (6275183).

18825537 is an equidigital number, since it uses as much as digits as its factorization.

18825537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6275182.

The product of its digits is 67200, while the sum is 39.

The square root of 18825537 is about 4338.8405133169. The cubic root of 18825537 is about 266.0209200197.

The spelling of 18825537 in words is "eighteen million, eight hundred twenty-five thousand, five hundred thirty-seven".