18946874 has 8 divisors (see below), whose sum is σ = 30092148. Its totient is φ = 8916160.

The previous prime is 18946867. The next prime is 18946877. The reversal of 18946874 is 47864981.

It can be written as a sum of positive squares in 2 ways, for example, as 18447025 + 499849 = 4295^2 + 707^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18946877) 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, 278597 + ... + 278664.

Almost surely, 2^18946874 is an apocalyptic number.

18946874 is a deficient number, since it is larger than the sum of its proper divisors (11145274).

18946874 is a wasteful number, since it uses less digits than its factorization.

18946874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557280.

The product of its digits is 387072, while the sum is 47.

The square root of 18946874 is about 4352.8007075905. The cubic root of 18946874 is about 266.5912283137.

The spelling of 18946874 in words is "eighteen million, nine hundred forty-six thousand, eight hundred seventy-four".