2720129 has 4 divisors (see below), whose sum is σ = 2793684. Its totient is φ = 2646576.

The previous prime is 2720117. The next prime is 2720147. The reversal of 2720129 is 9210272.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2496400 + 223729 = 1580^2 + 473^2 .

It is a cyclic number.

It is not a de Polignac number, because 2720129 - 2¹⁶ = 2654593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2720149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36722 + ... + 36795.

It is an arithmetic number, because the mean of its divisors is an integer number (698421).

2^2720129 is an apocalyptic number.

It is an amenable number.

2720129 is a deficient number, since it is larger than the sum of its proper divisors (73555).

2720129 is an equidigital number, since it uses as much as digits as its factorization.

2720129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73554.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 2720129 is about 1649.2813586529. The cubic root of 2720129 is about 139.5928476671.

The spelling of 2720129 in words is "two million, seven hundred twenty thousand, one hundred twenty-nine".