138076487 has 4 divisors (see below), whose sum is σ = 138234096. Its totient is φ = 137918880.

The previous prime is 138076457. The next prime is 138076517. The reversal of 138076487 is 784670831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 784670831 = 7 ⋅112095833.

It is an interprime number because it is at equal distance from previous prime (138076457) and next prime (138076517).

It is a cyclic number.

It is not a de Polignac number, because 138076487 - 2⁸ = 138076231 is a prime.

It is a super-2 number, since 2×138076487² = 38130232524522338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138076447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77483 + ... + 79244.

It is an arithmetic number, because the mean of its divisors is an integer number (34558524).

Almost surely, 2^138076487 is an apocalyptic number.

138076487 is a deficient number, since it is larger than the sum of its proper divisors (157609).

138076487 is an equidigital number, since it uses as much as digits as its factorization.

138076487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157608.

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 138076487 is about 11750.5951764155. The cubic root of 138076487 is about 516.8603805471.

The spelling of 138076487 in words is "one hundred thirty-eight million, seventy-six thousand, four hundred eighty-seven".