18959966 has 4 divisors (see below), whose sum is σ = 28439952. Its totient is φ = 9479982.

The previous prime is 18959869. The next prime is 18959977. The reversal of 18959966 is 66995981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66995981 = 13 ⋅5153537.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4739990 + ... + 4739993.

It is an arithmetic number, because the mean of its divisors is an integer number (7109988).

Almost surely, 2^18959966 is an apocalyptic number.

18959966 is a deficient number, since it is larger than the sum of its proper divisors (9479986).

18959966 is an equidigital number, since it uses as much as digits as its factorization.

18959966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9479985.

The product of its digits is 1049760, while the sum is 53.

The square root of 18959966 is about 4354.3043072344. The cubic root of 18959966 is about 266.6526176626.

The spelling of 18959966 in words is "eighteen million, nine hundred fifty-nine thousand, nine hundred sixty-six".