18988361 has 8 divisors (see below), whose sum is σ = 21976320. Its totient is φ = 16069248.

The previous prime is 18988357. The next prime is 18988367. The reversal of 18988361 is 16388981.

It is a happy number.

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 18988361 - 2² = 18988357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18988367) 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, 16616 + ... + 17721.

It is an arithmetic number, because the mean of its divisors is an integer number (2747040).

Almost surely, 2^18988361 is an apocalyptic number.

It is an amenable number.

18988361 is a deficient number, since it is larger than the sum of its proper divisors (2987959).

18988361 is an equidigital number, since it uses as much as digits as its factorization.

18988361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34423.

The product of its digits is 82944, while the sum is 44.

The square root of 18988361 is about 4357.5636541535. The cubic root of 18988361 is about 266.7856668535.

The spelling of 18988361 in words is "eighteen million, nine hundred eighty-eight thousand, three hundred sixty-one".