18961874 has 4 divisors (see below), whose sum is σ = 28442814. Its totient is φ = 9480936.

The previous prime is 18961847. The next prime is 18961879. The reversal of 18961874 is 47816981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17581249 + 1380625 = 4193^2 + 1175^2 .

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18961879) 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 as a sum of consecutive naturals, namely, 4740467 + ... + 4740470.

Almost surely, 2^18961874 is an apocalyptic number.

18961874 is a deficient number, since it is larger than the sum of its proper divisors (9480940).

18961874 is an equidigital number, since it uses as much as digits as its factorization.

18961874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9480939.

The product of its digits is 96768, while the sum is 44.

The square root of 18961874 is about 4354.5233952753. The cubic root of 18961874 is about 266.6615620551.

The spelling of 18961874 in words is "eighteen million, nine hundred sixty-one thousand, eight hundred seventy-four".