18648149 has 4 divisors (see below), whose sum is σ = 20082636. Its totient is φ = 17213664.

The previous prime is 18648137. The next prime is 18648151. The reversal of 18648149 is 94184681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2592100 + 16056049 = 1610^2 + 4007^2 .

It is not a de Polignac number, because 18648149 - 2²⁴ = 1870933 is a prime.

It is a super-2 number, since 2×18648149² = 695506922252402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18648109) 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 3 ways as a sum of consecutive naturals, for example, 717224 + ... + 717249.

It is an arithmetic number, because the mean of its divisors is an integer number (5020659).

Almost surely, 2^18648149 is an apocalyptic number.

It is an amenable number.

18648149 is a deficient number, since it is larger than the sum of its proper divisors (1434487).

18648149 is a wasteful number, since it uses less digits than its factorization.

18648149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434486.

The product of its digits is 55296, while the sum is 41.

The square root of 18648149 is about 4318.3502637002. The cubic root of 18648149 is about 265.1827338200.

The spelling of 18648149 in words is "eighteen million, six hundred forty-eight thousand, one hundred forty-nine".