39897129 has 4 divisors (see below), whose sum is σ = 53196176. Its totient is φ = 26598084.

The previous prime is 39897097. The next prime is 39897191. The reversal of 39897129 is 92179893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 39897129 - 2⁵ = 39897097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39897029) 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, 6649519 + ... + 6649524.

It is an arithmetic number, because the mean of its divisors is an integer number (13299044).

Almost surely, 2^39897129 is an apocalyptic number.

It is an amenable number.

39897129 is a deficient number, since it is larger than the sum of its proper divisors (13299047).

39897129 is a wasteful number, since it uses less digits than its factorization.

39897129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13299046.

The product of its digits is 244944, while the sum is 48.

The square root of 39897129 is about 6316.4174181256. The cubic root of 39897129 is about 341.7017594201.

The spelling of 39897129 in words is "thirty-nine million, eight hundred ninety-seven thousand, one hundred twenty-nine".