138871378 has 16 divisors (see below), whose sum is σ = 218814336. Its totient is φ = 65973600.

The previous prime is 138871363. The next prime is 138871391. The reversal of 138871378 is 873178831.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (46).

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, 3051 + ... + 16942.

It is an arithmetic number, because the mean of its divisors is an integer number (13675896).

Almost surely, 2^138871378 is an apocalyptic number.

138871378 is a deficient number, since it is larger than the sum of its proper divisors (79942958).

138871378 is a wasteful number, since it uses less digits than its factorization.

138871378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20169.

The product of its digits is 225792, while the sum is 46.

The square root of 138871378 is about 11784.3700722610. The cubic root of 138871378 is about 517.8503192497.

The spelling of 138871378 in words is "one hundred thirty-eight million, eight hundred seventy-one thousand, three hundred seventy-eight".