18148897 has 4 divisors (see below), whose sum is σ = 19544980. Its totient is φ = 16752816.

The previous prime is 18148873. The next prime is 18148901. The reversal of 18148897 is 79884181.

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 1535121 + 16613776 = 1239^2 + 4076^2 .

It is a cyclic number.

It is not a de Polignac number, because 18148897 - 2⁷ = 18148769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18140897) 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, 698022 + ... + 698047.

It is an arithmetic number, because the mean of its divisors is an integer number (4886245).

Almost surely, 2^18148897 is an apocalyptic number.

It is an amenable number.

18148897 is a deficient number, since it is larger than the sum of its proper divisors (1396083).

18148897 is a wasteful number, since it uses less digits than its factorization.

18148897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396082.

The product of its digits is 129024, while the sum is 46.

The square root of 18148897 is about 4260.1522273271. The cubic root of 18148897 is about 262.7947865944.

The spelling of 18148897 in words is "eighteen million, one hundred forty-eight thousand, eight hundred ninety-seven".