138391444948 has 6 divisors (see below), whose sum is σ = 242185028666. Its totient is φ = 69195722472.

The previous prime is 138391444913. The next prime is 138391444973. The reversal of 138391444948 is 849444193831.

It can be written as a sum of positive squares in only one way, i.e., 132796105744 + 5595339204 = 364412^2 + 74802^2 .

It is a junction number, because it is equal to n+sod(n) for n = 138391444892 and 138391444901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17298930615 + ... + 17298930622.

Almost surely, 2^138391444948 is an apocalyptic number.

It is an amenable number.

138391444948 is a deficient number, since it is larger than the sum of its proper divisors (103793583718).

138391444948 is a wasteful number, since it uses less digits than its factorization.

138391444948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34597861241 (or 34597861239 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 58.

The spelling of 138391444948 in words is "one hundred thirty-eight billion, three hundred ninety-one million, four hundred forty-four thousand, nine hundred forty-eight".