115138729 has 8 divisors (see below), whose sum is σ = 119418120. Its totient is φ = 110880000.

The previous prime is 115138717. The next prime is 115138747. The reversal of 115138729 is 927831511.

It can be written as a sum of positive squares in 4 ways, for example, as 85599504 + 29539225 = 9252^2 + 5435^2 .

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 115138729 - 2⁵ = 115138697 is a prime.

It is a super-4 number, since 4×115138729⁴ (a number of 33 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115138789) 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, 6679 + ... + 16579.

It is an arithmetic number, because the mean of its divisors is an integer number (14927265).

Almost surely, 2^115138729 is an apocalyptic number.

It is an amenable number.

115138729 is a deficient number, since it is larger than the sum of its proper divisors (4279391).

115138729 is an equidigital number, since it uses as much as digits as its factorization.

115138729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10331.

The product of its digits is 15120, while the sum is 37.

The square root of 115138729 is about 10730.2716181838. The cubic root of 115138729 is about 486.4898798572.

The spelling of 115138729 in words is "one hundred fifteen million, one hundred thirty-eight thousand, seven hundred twenty-nine".