138178587 has 8 divisors (see below), whose sum is σ = 184322880. Its totient is φ = 92076680.

The previous prime is 138178571. The next prime is 138178613. The reversal of 138178587 is 785871831.

It is a happy number.

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 138178587 - 2⁴ = 138178571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138178787) 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, 1989 + ... + 16742.

It is an arithmetic number, because the mean of its divisors is an integer number (23040360).

Almost surely, 2^138178587 is an apocalyptic number.

138178587 is a deficient number, since it is larger than the sum of its proper divisors (46144293).

138178587 is a wasteful number, since it uses less digits than its factorization.

138178587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21193.

The product of its digits is 376320, while the sum is 48.

The square root of 138178587 is about 11754.9388343794. The cubic root of 138178587 is about 516.9877458071.

The spelling of 138178587 in words is "one hundred thirty-eight million, one hundred seventy-eight thousand, five hundred eighty-seven".