138894039811 has 4 divisors (see below), whose sum is σ = 139026447000. Its totient is φ = 138761632624.

The previous prime is 138894039797. The next prime is 138894039887. The reversal of 138894039811 is 118930498831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 118930498831 = 877 ⋅135610603.

It is a cyclic number.

It is not a de Polignac number, because 138894039811 - 2²¹ = 138891942659 is a prime.

It is a super-3 number, since 3×138894039811³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138894939811) 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, 66202021 + ... + 66204118.

It is an arithmetic number, because the mean of its divisors is an integer number (34756611750).

Almost surely, 2^138894039811 is an apocalyptic number.

138894039811 is a deficient number, since it is larger than the sum of its proper divisors (132407189).

138894039811 is a wasteful number, since it uses less digits than its factorization.

138894039811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132407188.

The product of its (nonzero) digits is 1492992, while the sum is 55.

The spelling of 138894039811 in words is "one hundred thirty-eight billion, eight hundred ninety-four million, thirty-nine thousand, eight hundred eleven".