18980387 has 2 divisors, whose sum is σ = 18980388. Its totient is φ = 18980386.

The previous prime is 18980383. The next prime is 18980389. The reversal of 18980387 is 78308981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18980387 - 2² = 18980383 is a prime.

Together with 18980389, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18980383) 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, 9490193 + 9490194.

It is an arithmetic number, because the mean of its divisors is an integer number (9490194).

Almost surely, 2^18980387 is an apocalyptic number.

18980387 is a deficient number, since it is larger than the sum of its proper divisors (1).

18980387 is an equidigital number, since it uses as much as digits as its factorization.

18980387 is an odious number, because the sum of its binary digits is odd.

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

The square root of 18980387 is about 4356.6485972591. The cubic root of 18980387 is about 266.7483168374.

The spelling of 18980387 in words is "eighteen million, nine hundred eighty thousand, three hundred eighty-seven".