18948249 has 20 divisors (see below), whose sum is σ = 28422900. Its totient is φ = 12579840.

The previous prime is 18948221. The next prime is 18948253. The reversal of 18948249 is 94284981.

It can be written as a sum of positive squares in 2 ways, for example, as 8450649 + 10497600 = 2907^2 + 3240^2 .

It is not a de Polignac number, because 18948249 - 2⁷ = 18948121 is a prime.

It is a super-2 number, since 2×18948249² = 718072280332002, which contains 22 as substring.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (18948289) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 36109 + ... + 36629.

It is an arithmetic number, because the mean of its divisors is an integer number (1421145).

Almost surely, 2^18948249 is an apocalyptic number.

It is an amenable number.

18948249 is a deficient number, since it is larger than the sum of its proper divisors (9474651).

18948249 is an equidigital number, since it uses as much as digits as its factorization.

18948249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982 (or 973 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 18948249 is about 4352.9586490110. The cubic root of 18948249 is about 266.5976771185.

The spelling of 18948249 in words is "eighteen million, nine hundred forty-eight thousand, two hundred forty-nine".