18039779 has 2 divisors, whose sum is σ = 18039780. Its totient is φ = 18039778.

The previous prime is 18039767. The next prime is 18039803. The reversal of 18039779 is 97793081.

It is a weak prime.

It is an emirp because it is prime and its reverse (97793081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18039779 - 2¹² = 18035683 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18039719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9019889 + 9019890.

It is an arithmetic number, because the mean of its divisors is an integer number (9019890).

Almost surely, 2^18039779 is an apocalyptic number.

18039779 is a deficient number, since it is larger than the sum of its proper divisors (1).

18039779 is an equidigital number, since it uses as much as digits as its factorization.

18039779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 18039779 is about 4247.3261000305. The cubic root of 18039779 is about 262.2670538101.

The spelling of 18039779 in words is "eighteen million, thirty-nine thousand, seven hundred seventy-nine".