2129725409 has 8 divisors (see below), whose sum is σ = 2562075840. Its totient is φ = 1729400976.

The previous prime is 2129725399. The next prime is 2129725421. The reversal of 2129725409 is 9045279212.

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

It is not a de Polignac number, because 2129725409 - 2⁴ = 2129725393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2129725109) 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, 8006354 + ... + 8006619.

It is an arithmetic number, because the mean of its divisors is an integer number (320259480).

Almost surely, 2^2129725409 is an apocalyptic number.

It is an amenable number.

2129725409 is a deficient number, since it is larger than the sum of its proper divisors (432350431).

2129725409 is a wasteful number, since it uses less digits than its factorization.

2129725409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16012999.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 2129725409 is about 46148.9480811860. The cubic root of 2129725409 is about 1286.5930590108.

The spelling of 2129725409 in words is "two billion, one hundred twenty-nine million, seven hundred twenty-five thousand, four hundred nine".