138564742 has 16 divisors (see below), whose sum is σ = 221501952. Its totient is φ = 64859080.

The previous prime is 138564721. The next prime is 138564749. The reversal of 138564742 is 247465831.

It is a junction number, because it is equal to n+sod(n) for n = 138564695 and 138564704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138564749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29884 + ... + 34207.

It is an arithmetic number, because the mean of its divisors is an integer number (13843872).

Almost surely, 2^138564742 is an apocalyptic number.

138564742 is a deficient number, since it is larger than the sum of its proper divisors (82937210).

138564742 is a wasteful number, since it uses less digits than its factorization.

138564742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64163.

The product of its digits is 161280, while the sum is 40.

The square root of 138564742 is about 11771.3525985759. The cubic root of 138564742 is about 517.4688905972.

The spelling of 138564742 in words is "one hundred thirty-eight million, five hundred sixty-four thousand, seven hundred forty-two".