138732078 has 16 divisors (see below), whose sum is σ = 278781696. Its totient is φ = 46024440.

The previous prime is 138732049. The next prime is 138732079. The reversal of 138732078 is 870237831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138732079) 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 7 ways as a sum of consecutive naturals, for example, 53526 + ... + 56057.

It is an arithmetic number, because the mean of its divisors is an integer number (17423856).

Almost surely, 2^138732078 is an apocalyptic number.

138732078 is an abundant number, since it is smaller than the sum of its proper divisors (140049618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138732078 is a wasteful number, since it uses less digits than its factorization.

138732078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109799.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 138732078 is about 11778.4582182899. The cubic root of 138732078 is about 517.6771117736.

It can be divided in two parts, 13873 and 2078, that added together give a palindrome (15951).

The spelling of 138732078 in words is "one hundred thirty-eight million, seven hundred thirty-two thousand, seventy-eight".