138512487 has 8 divisors (see below), whose sum is σ = 185341680. Its totient is φ = 92012480.

The previous prime is 138512483. The next prime is 138512533. The reversal of 138512487 is 784215831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138512487 - 2² = 138512483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138512483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81312 + ... + 82997.

It is an arithmetic number, because the mean of its divisors is an integer number (23167710).

Almost surely, 2^138512487 is an apocalyptic number.

138512487 is a deficient number, since it is larger than the sum of its proper divisors (46829193).

138512487 is a wasteful number, since it uses less digits than its factorization.

138512487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164593.

The product of its digits is 53760, while the sum is 39.

The square root of 138512487 is about 11769.1328057763. The cubic root of 138512487 is about 517.4038337958.

The spelling of 138512487 in words is "one hundred thirty-eight million, five hundred twelve thousand, four hundred eighty-seven".