18943385 has 8 divisors (see below), whose sum is σ = 22773960. Its totient is φ = 15126784.

The previous prime is 18943381. The next prime is 18943417. The reversal of 18943385 is 58334981.

It can be written as a sum of positive squares in 4 ways, for example, as 3481 + 18939904 = 59^2 + 4352^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18943385 - 2² = 18943381 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18943381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230 + ... + 6159.

It is an arithmetic number, because the mean of its divisors is an integer number (2846745).

Almost surely, 2^18943385 is an apocalyptic number.

It is an amenable number.

18943385 is a deficient number, since it is larger than the sum of its proper divisors (3830575).

18943385 is an equidigital number, since it uses as much as digits as its factorization.

18943385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6987.

The product of its digits is 103680, while the sum is 41.

The square root of 18943385 is about 4352.3999126918. The cubic root of 18943385 is about 266.5748633645.

The spelling of 18943385 in words is "eighteen million, nine hundred forty-three thousand, three hundred eighty-five".