138310638 has 32 divisors (see below), whose sum is σ = 289529856. Its totient is φ = 43964448.

The previous prime is 138310637. The next prime is 138310639. The reversal of 138310638 is 836013831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (138310637) and next prime (138310639).

It is a junction number, because it is equal to n+sod(n) for n = 138310599 and 138310608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138310637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50131 + ... + 52817.

It is an arithmetic number, because the mean of its divisors is an integer number (9047808).

Almost surely, 2^138310638 is an apocalyptic number.

138310638 is an abundant number, since it is smaller than the sum of its proper divisors (151219218).

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

138310638 is a wasteful number, since it uses less digits than its factorization.

138310638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3088.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 138310638 is about 11760.5543236703. The cubic root of 138310638 is about 517.1523806098.

It can be divided in two parts, 1383 and 10638, that added together give a palindrome (12021).

The spelling of 138310638 in words is "one hundred thirty-eight million, three hundred ten thousand, six hundred thirty-eight".