18825993 has 8 divisors (see below), whose sum is σ = 27890400. Its totient is φ = 12550644.

The previous prime is 18825973. The next prime is 18826037. The reversal of 18825993 is 39952881.

It is a happy number.

It is not a de Polignac number, because 18825993 - 2¹⁰ = 18824969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18825923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 348603 + ... + 348656.

It is an arithmetic number, because the mean of its divisors is an integer number (3486300).

Almost surely, 2^18825993 is an apocalyptic number.

It is an amenable number.

18825993 is a deficient number, since it is larger than the sum of its proper divisors (9064407).

18825993 is an equidigital number, since it uses as much as digits as its factorization.

18825993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697268 (or 697262 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 18825993 is about 4338.8930615999. The cubic root of 18825993 is about 266.0230678922.

It can be divided in two parts, 1882 and 5993, that added together give a triangular number (7875 = T₁₂₅).

The spelling of 18825993 in words is "eighteen million, eight hundred twenty-five thousand, nine hundred ninety-three".