138745487 has 2 divisors, whose sum is σ = 138745488. Its totient is φ = 138745486.

The previous prime is 138745463. The next prime is 138745493. The reversal of 138745487 is 784547831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138745487 - 2⁶ = 138745423 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138741487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69372743 + 69372744.

It is an arithmetic number, because the mean of its divisors is an integer number (69372744).

Almost surely, 2^138745487 is an apocalyptic number.

138745487 is a deficient number, since it is larger than the sum of its proper divisors (1).

138745487 is an equidigital number, since it uses as much as digits as its factorization.

138745487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 752640, while the sum is 47.

The square root of 138745487 is about 11779.0274216507. The cubic root of 138745487 is about 517.6937897447.

The spelling of 138745487 in words is "one hundred thirty-eight million, seven hundred forty-five thousand, four hundred eighty-seven".