18870934 has 4 divisors (see below), whose sum is σ = 28306404. Its totient is φ = 9435466.

The previous prime is 18870931. The next prime is 18870949. The reversal of 18870934 is 43907881.

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

It is a super-2 number, since 2×18870934² = 712224300064712, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18870931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4717732 + ... + 4717735.

It is an arithmetic number, because the mean of its divisors is an integer number (7076601).

Almost surely, 2^18870934 is an apocalyptic number.

18870934 is a deficient number, since it is larger than the sum of its proper divisors (9435470).

18870934 is an equidigital number, since it uses as much as digits as its factorization.

18870934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9435469.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 18870934 is about 4344.0688300256. The cubic root of 18870934 is about 266.2345811639.

The spelling of 18870934 in words is "eighteen million, eight hundred seventy thousand, nine hundred thirty-four".