138678089 has 4 divisors (see below), whose sum is σ = 151285200. Its totient is φ = 126070980.

The previous prime is 138678079. The next prime is 138678091. The reversal of 138678089 is 980876831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138678089 - 2⁴ = 138678073 is a prime.

It is a super-2 number, since 2×138678089² = 38463224737383842, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138678079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6303539 + ... + 6303560.

It is an arithmetic number, because the mean of its divisors is an integer number (37821300).

Almost surely, 2^138678089 is an apocalyptic number.

It is an amenable number.

138678089 is a deficient number, since it is larger than the sum of its proper divisors (12607111).

138678089 is a wasteful number, since it uses less digits than its factorization.

138678089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12607110.

The product of its (nonzero) digits is 580608, while the sum is 50.

The square root of 138678089 is about 11776.1661418307. The cubic root of 138678089 is about 517.6099499551.

The spelling of 138678089 in words is "one hundred thirty-eight million, six hundred seventy-eight thousand, eighty-nine".