137971729 has 8 divisors (see below), whose sum is σ = 158191488. Its totient is φ = 117879360.

The previous prime is 137971699. The next prime is 137971739. The reversal of 137971729 is 927179731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 137971729 - 2⁵ = 137971697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (137971739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29512 + ... + 33865.

It is an arithmetic number, because the mean of its divisors is an integer number (19773936).

Almost surely, 2^137971729 is an apocalyptic number.

It is an amenable number.

137971729 is a deficient number, since it is larger than the sum of its proper divisors (20219759).

137971729 is an equidigital number, since it uses as much as digits as its factorization.

137971729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63695.

The product of its digits is 166698, while the sum is 46.

The square root of 137971729 is about 11746.1367691680. The cubic root of 137971729 is about 516.7296342727.

The spelling of 137971729 in words is "one hundred thirty-seven million, nine hundred seventy-one thousand, seven hundred twenty-nine".