138747487 has 2 divisors, whose sum is σ = 138747488. Its totient is φ = 138747486.

The previous prime is 138747467. The next prime is 138747503. The reversal of 138747487 is 784747831.

138747487 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138747487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138747487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138747457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69373743 + 69373744.

It is an arithmetic number, because the mean of its divisors is an integer number (69373744).

Almost surely, 2^138747487 is an apocalyptic number.

138747487 is a deficient number, since it is larger than the sum of its proper divisors (1).

138747487 is an equidigital number, since it uses as much as digits as its factorization.

138747487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1053696, while the sum is 49.

The square root of 138747487 is about 11779.1123179975. The cubic root of 138747487 is about 517.6962772312.

The spelling of 138747487 in words is "one hundred thirty-eight million, seven hundred forty-seven thousand, four hundred eighty-seven".