18474866 has 4 divisors (see below), whose sum is σ = 27712302. Its totient is φ = 9237432.

The previous prime is 18474823. The next prime is 18474889. The reversal of 18474866 is 66847481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66847481 = 1153 ⋅57977.

It can be written as a sum of positive squares in only one way, i.e., 15768841 + 2706025 = 3971^2 + 1645^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4618715 + ... + 4618718.

Almost surely, 2^18474866 is an apocalyptic number.

18474866 is a deficient number, since it is larger than the sum of its proper divisors (9237436).

18474866 is an equidigital number, since it uses as much as digits as its factorization.

18474866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9237435.

The product of its digits is 258048, while the sum is 44.

The square root of 18474866 is about 4298.2398723198. The cubic root of 18474866 is about 264.3587962766.

The spelling of 18474866 in words is "eighteen million, four hundred seventy-four thousand, eight hundred sixty-six".