18916966 has 4 divisors (see below), whose sum is σ = 28375452. Its totient is φ = 9458482.

The previous prime is 18916957. The next prime is 18916967. The reversal of 18916966 is 66961981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66961981 = 47 ⋅1424723.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18916967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4729240 + ... + 4729243.

It is an arithmetic number, because the mean of its divisors is an integer number (7093863).

Almost surely, 2^18916966 is an apocalyptic number.

18916966 is a deficient number, since it is larger than the sum of its proper divisors (9458486).

18916966 is an equidigital number, since it uses as much as digits as its factorization.

18916966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9458485.

The product of its digits is 139968, while the sum is 46.

The square root of 18916966 is about 4349.3638615319. The cubic root of 18916966 is about 266.4508813375.

The spelling of 18916966 in words is "eighteen million, nine hundred sixteen thousand, nine hundred sixty-six".