2140729 has 2 divisors, whose sum is σ = 2140730. Its totient is φ = 2140728.

The previous prime is 2140681. The next prime is 2140741. The reversal of 2140729 is 9270412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1836025 + 304704 = 1355^2 + 552^2 .

It is a cyclic number.

It is not a de Polignac number, because 2140729 - 2⁷ = 2140601 is a prime.

It is not a weakly prime, because it can be changed into another prime (2140769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1070364 + 1070365.

It is an arithmetic number, because the mean of its divisors is an integer number (1070365).

2^2140729 is an apocalyptic number.

It is an amenable number.

2140729 is a deficient number, since it is larger than the sum of its proper divisors (1).

2140729 is an equidigital number, since it uses as much as digits as its factorization.

2140729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 2140729 is about 1463.1230296868. The cubic root of 2140729 is about 128.8805054936.

The spelling of 2140729 in words is "two million, one hundred forty thousand, seven hundred twenty-nine".