138861437764 has 12 divisors (see below), whose sum is σ = 277722875584. Its totient is φ = 59512044744.

The previous prime is 138861437761. The next prime is 138861437779. The reversal of 138861437764 is 467734168831.

138861437764 is an admirable number.

It is a hoax number, since the sum of its digits (58) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 138861437699 and 138861437708.

It is not an unprimeable number, because it can be changed into a prime (138861437761) 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, 2479668504 + ... + 2479668559.

Almost surely, 2^138861437764 is an apocalyptic number.

138861437764 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

138861437764 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138861437764 is a wasteful number, since it uses less digits than its factorization.

138861437764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4959337074 (or 4959337072 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 58.

The spelling of 138861437764 in words is "one hundred thirty-eight billion, eight hundred sixty-one million, four hundred thirty-seven thousand, seven hundred sixty-four".