138678087 has 16 divisors (see below), whose sum is σ = 193263840. Its totient is φ = 88338432.

The previous prime is 138678079. The next prime is 138678091. The reversal of 138678087 is 780876831.

It is not a de Polignac number, because 138678087 - 2³ = 138678079 is a prime.

It is a super-2 number, since 2×138678087² = 38463223627959138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138678047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223 + ... + 16655.

It is an arithmetic number, because the mean of its divisors is an integer number (12078990).

Almost surely, 2^138678087 is an apocalyptic number.

138678087 is a deficient number, since it is larger than the sum of its proper divisors (54585753).

138678087 is a wasteful number, since it uses less digits than its factorization.

138678087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16562.

The product of its (nonzero) digits is 451584, while the sum is 48.

The square root of 138678087 is about 11776.1660569134. The cubic root of 138678087 is about 517.6099474668.

The spelling of 138678087 in words is "one hundred thirty-eight million, six hundred seventy-eight thousand, eighty-seven".