137939797 has 4 divisors (see below), whose sum is σ = 138107020. Its totient is φ = 137772576.

The previous prime is 137939779. The next prime is 137939831. The reversal of 137939797 is 797939731.

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: 797939731 = 227 ⋅3515153.

It can be written as a sum of positive squares in 2 ways, for example, as 43480836 + 94458961 = 6594^2 + 9719^2 .

It is a cyclic number.

It is not a de Polignac number, because 137939797 - 2¹¹ = 137937749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137939777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82368 + ... + 84025.

It is an arithmetic number, because the mean of its divisors is an integer number (34526755).

Almost surely, 2^137939797 is an apocalyptic number.

It is an amenable number.

137939797 is a deficient number, since it is larger than the sum of its proper divisors (167223).

137939797 is an equidigital number, since it uses as much as digits as its factorization.

137939797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167222.

The product of its digits is 2250423, while the sum is 55.

The square root of 137939797 is about 11744.7774350985. Note that the first 3 decimals coincide. The cubic root of 137939797 is about 516.6897674490.

The spelling of 137939797 in words is "one hundred thirty-seven million, nine hundred thirty-nine thousand, seven hundred ninety-seven".