138768742 has 32 divisors (see below), whose sum is σ = 251596800. Its totient is φ = 56075328.

The previous prime is 138768727. The next prime is 138768743. The reversal of 138768742 is 247867831.

It is a junction number, because it is equal to n+sod(n) for n = 138768692 and 138768701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138768743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60859 + ... + 63097.

It is an arithmetic number, because the mean of its divisors is an integer number (7862400).

Almost surely, 2^138768742 is an apocalyptic number.

138768742 is a deficient number, since it is larger than the sum of its proper divisors (112828058).

138768742 is a wasteful number, since it uses less digits than its factorization.

138768742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500.

The product of its digits is 451584, while the sum is 46.

The square root of 138768742 is about 11780.0145161201. The cubic root of 138768742 is about 517.7227115179.

The spelling of 138768742 in words is "one hundred thirty-eight million, seven hundred sixty-eight thousand, seven hundred forty-two".