18900000479 has 2 divisors, whose sum is σ = 18900000480. Its totient is φ = 18900000478.

The previous prime is 18900000439. The next prime is 18900000487. The reversal of 18900000479 is 97400000981.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18900000479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18900000439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9450000239 + 9450000240.

It is an arithmetic number, because the mean of its divisors is an integer number (9450000240).

Almost surely, 2^18900000479 is an apocalyptic number.

18900000479 is a deficient number, since it is larger than the sum of its proper divisors (1).

18900000479 is an equidigital number, since it uses as much as digits as its factorization.

18900000479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 38.

The spelling of 18900000479 in words is "eighteen billion, nine hundred million, four hundred seventy-nine", and thus it is an aban number.