18745331 has 4 divisors (see below), whose sum is σ = 20449464. Its totient is φ = 17041200.

The previous prime is 18745319. The next prime is 18745333. The reversal of 18745331 is 13354781.

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

It is not a de Polignac number, because 18745331 - 2¹⁰ = 18744307 is a prime.

It is a super-2 number, since 2×18745331² = 702774868599122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18745333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 852050 + ... + 852071.

It is an arithmetic number, because the mean of its divisors is an integer number (5112366).

Almost surely, 2^18745331 is an apocalyptic number.

18745331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18745331 is a deficient number, since it is larger than the sum of its proper divisors (1704133).

18745331 is a wasteful number, since it uses less digits than its factorization.

18745331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1704132.

The product of its digits is 10080, while the sum is 32.

The square root of 18745331 is about 4329.5878556740. The cubic root of 18745331 is about 265.6425891190.

The spelling of 18745331 in words is "eighteen million, seven hundred forty-five thousand, three hundred thirty-one".