138597841394 has 4 divisors (see below), whose sum is σ = 207896762094. Its totient is φ = 69298920696.

The previous prime is 138597841387. The next prime is 138597841399. The reversal of 138597841394 is 493148795831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 129033979369 + 9563862025 = 359213^2 + 97795^2 .

It is not an unprimeable number, because it can be changed into a prime (138597841399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34649460347 + ... + 34649460350.

Almost surely, 2^138597841394 is an apocalyptic number.

138597841394 is a deficient number, since it is larger than the sum of its proper divisors (69298920700).

138597841394 is an equidigital number, since it uses as much as digits as its factorization.

138597841394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69298920699.

The product of its digits is 26127360, while the sum is 62.

The spelling of 138597841394 in words is "one hundred thirty-eight billion, five hundred ninety-seven million, eight hundred forty-one thousand, three hundred ninety-four".