18747307387 has 2 divisors, whose sum is σ = 18747307388. Its totient is φ = 18747307386.

The previous prime is 18747307373. The next prime is 18747307457. The reversal of 18747307387 is 78370374781.

It is a weak prime.

It is an emirp because it is prime and its reverse (78370374781) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18747307387 is a prime.

It is not a weakly prime, because it can be changed into another prime (18747307307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9373653693 + 9373653694.

It is an arithmetic number, because the mean of its divisors is an integer number (9373653694).

Almost surely, 2^18747307387 is an apocalyptic number.

18747307387 is a deficient number, since it is larger than the sum of its proper divisors (1).

18747307387 is an equidigital number, since it uses as much as digits as its factorization.

18747307387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5531904, while the sum is 55.

The spelling of 18747307387 in words is "eighteen billion, seven hundred forty-seven million, three hundred seven thousand, three hundred eighty-seven".