18198755 has 16 divisors (see below), whose sum is σ = 23242464. Its totient is φ = 13632000.

The previous prime is 18198743. The next prime is 18198757. The reversal of 18198755 is 55789181.

It is a happy number.

It is a Cunningham number, because it is equal to 4266²-1.

It is not a de Polignac number, because 18198755 - 2²² = 14004451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18198757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20909 + ... + 21761.

It is an arithmetic number, because the mean of its divisors is an integer number (1452654).

Almost surely, 2^18198755 is an apocalyptic number.

18198755 is a deficient number, since it is larger than the sum of its proper divisors (5043709).

18198755 is a wasteful number, since it uses less digits than its factorization.

18198755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126.

The product of its digits is 100800, while the sum is 44.

The square root of 18198755 is about 4265.9998827942. Note that the first 3 decimals coincide. The cubic root of 18198755 is about 263.0352133741.

The spelling of 18198755 in words is "eighteen million, one hundred ninety-eight thousand, seven hundred fifty-five".