138391444892 has 12 divisors (see below), whose sum is σ = 242244840936. Its totient is φ = 69178633200.

The previous prime is 138391444837. The next prime is 138391444913. The reversal of 138391444892 is 298444193831.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4254083 + ... + 4286490.

It is an arithmetic number, because the mean of its divisors is an integer number (20187070078).

Almost surely, 2^138391444892 is an apocalyptic number.

It is an amenable number.

138391444892 is a deficient number, since it is larger than the sum of its proper divisors (103853396044).

138391444892 is a wasteful number, since it uses less digits than its factorization.

138391444892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8544628 (or 8544626 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 56.

The spelling of 138391444892 in words is "one hundred thirty-eight billion, three hundred ninety-one million, four hundred forty-four thousand, eight hundred ninety-two".