138878582 has 16 divisors (see below), whose sum is σ = 211397040. Its totient is φ = 68420352.

The previous prime is 138878573. The next prime is 138878591. The reversal of 138878582 is 285878831.

138878582 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (138878573) and next prime (138878591).

It is a self number, because there is not a number n which added to its sum of digits gives 138878582.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38738 + ... + 42170.

It is an arithmetic number, because the mean of its divisors is an integer number (13212315).

Almost surely, 2^138878582 is an apocalyptic number.

138878582 is a deficient number, since it is larger than the sum of its proper divisors (72518458).

138878582 is a wasteful number, since it uses less digits than its factorization.

138878582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3727.

The product of its digits is 860160, while the sum is 50.

The square root of 138878582 is about 11784.6757274012. The cubic root of 138878582 is about 517.8592736487.

The spelling of 138878582 in words is "one hundred thirty-eight million, eight hundred seventy-eight thousand, five hundred eighty-two".