138604623748 has 18 divisors (see below), whose sum is σ = 245892091326. Its totient is φ = 68349827808.

The previous prime is 138604623719. The next prime is 138604623799. The reversal of 138604623748 is 847326406831.

It can be written as a sum of positive squares in only one way, i.e., 121516382464 + 17088241284 = 348592^2 + 130722^2 .

It is a super-2 number, since 2×138604623748² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138604623695 and 138604623704.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6350911 + ... + 6372697.

Almost surely, 2^138604623748 is an apocalyptic number.

It is an amenable number.

138604623748 is a deficient number, since it is larger than the sum of its proper divisors (107287467578).

138604623748 is an frugal number, since it uses more digits than its factorization.

138604623748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43651 (or 21862 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 52.

The spelling of 138604623748 in words is "one hundred thirty-eight billion, six hundred four million, six hundred twenty-three thousand, seven hundred forty-eight".