139837079797 has 4 divisors (see below), whose sum is σ = 139967891980. Its totient is φ = 139706267616.

The previous prime is 139837079783. The next prime is 139837079819. The reversal of 139837079797 is 797970738931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 797970738931 = 179 ⋅4457937089.

It can be written as a sum of positive squares in 2 ways, for example, as 63984208401 + 75852871396 = 252951^2 + 275414^2 .

It is a cyclic number.

It is not a de Polignac number, because 139837079797 - 2¹¹ = 139837077749 is a prime.

It is a super-2 number, since 2×139837079797² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139837079717) 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, 65404488 + ... + 65406625.

It is an arithmetic number, because the mean of its divisors is an integer number (34991972995).

Almost surely, 2^139837079797 is an apocalyptic number.

It is an amenable number.

139837079797 is a deficient number, since it is larger than the sum of its proper divisors (130812183).

139837079797 is a wasteful number, since it uses less digits than its factorization.

139837079797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130812182.

The product of its (nonzero) digits is 126023688, while the sum is 70.

The spelling of 139837079797 in words is "one hundred thirty-nine billion, eight hundred thirty-seven million, seventy-nine thousand, seven hundred ninety-seven".