138137738 has 8 divisors (see below), whose sum is σ = 207729732. Its totient is φ = 68894496.

The previous prime is 138137737. The next prime is 138137743. The reversal of 138137738 is 837731831.

It can be written as a sum of positive squares in 2 ways, for example, as 134629609 + 3508129 = 11603^2 + 1873^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 138137695 and 138137704.

It is not an unprimeable number, because it can be changed into a prime (138137731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86195 + ... + 87782.

Almost surely, 2^138137738 is an apocalyptic number.

138137738 is a deficient number, since it is larger than the sum of its proper divisors (69591994).

138137738 is a wasteful number, since it uses less digits than its factorization.

138137738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174376.

The product of its digits is 84672, while the sum is 41.

The square root of 138137738 is about 11753.2011809549. The cubic root of 138137738 is about 516.9367960078.

The spelling of 138137738 in words is "one hundred thirty-eight million, one hundred thirty-seven thousand, seven hundred thirty-eight".