138489742 has 16 divisors (see below), whose sum is σ = 217380672. Its totient is φ = 66100320.

The previous prime is 138489709. The next prime is 138489781. The reversal of 138489742 is 247984831.

It is a junction number, because it is equal to n+sod(n) for n = 138489692 and 138489701.

It is a congruent number.

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, 13734 + ... + 21577.

It is an arithmetic number, because the mean of its divisors is an integer number (13586292).

Almost surely, 2^138489742 is an apocalyptic number.

138489742 is a deficient number, since it is larger than the sum of its proper divisors (78890930).

138489742 is a wasteful number, since it uses less digits than its factorization.

138489742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35403.

The product of its digits is 387072, while the sum is 46.

The square root of 138489742 is about 11768.1664672114. The cubic root of 138489742 is about 517.3755114530.

The spelling of 138489742 in words is "one hundred thirty-eight million, four hundred eighty-nine thousand, seven hundred forty-two".