138651438 has 16 divisors (see below), whose sum is σ = 277575120. Its totient is φ = 46171776.

The previous prime is 138651421. The next prime is 138651449. The reversal of 138651438 is 834156831.

It is a junction number, because it is equal to n+sod(n) for n = 138651396 and 138651405.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4395 + ... + 17222.

It is an arithmetic number, because the mean of its divisors is an integer number (17348445).

Almost surely, 2^138651438 is an apocalyptic number.

138651438 is an abundant number, since it is smaller than the sum of its proper divisors (138923682).

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

138651438 is a wasteful number, since it uses less digits than its factorization.

138651438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22691.

The product of its digits is 69120, while the sum is 39.

The square root of 138651438 is about 11775.0345222424. The cubic root of 138651438 is about 517.5767899304.

The spelling of 138651438 in words is "one hundred thirty-eight million, six hundred fifty-one thousand, four hundred thirty-eight".