138752642 has 16 divisors (see below), whose sum is σ = 238036992. Its totient is φ = 59421600.

The previous prime is 138752597. The next prime is 138752671. The reversal of 138752642 is 246257831.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 138752596 and 138752605.

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, 22463 + ... + 27965.

It is an arithmetic number, because the mean of its divisors is an integer number (14877312).

Almost surely, 2^138752642 is an apocalyptic number.

138752642 is a deficient number, since it is larger than the sum of its proper divisors (99284350).

138752642 is a wasteful number, since it uses less digits than its factorization.

138752642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7313.

The product of its digits is 80640, while the sum is 38.

The square root of 138752642 is about 11779.3311355102. The cubic root of 138752642 is about 517.7026886176.

The spelling of 138752642 in words is "one hundred thirty-eight million, seven hundred fifty-two thousand, six hundred forty-two".