2947729 has 2 divisors, whose sum is σ = 2947730. Its totient is φ = 2947728.

The previous prime is 2947723. The next prime is 2947741. The reversal of 2947729 is 9277492.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2634129 + 313600 = 1623^2 + 560^2 .

It is a cyclic number.

It is not a de Polignac number, because 2947729 - 2⁷ = 2947601 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2947691 and 2947700.

It is not a weakly prime, because it can be changed into another prime (2947723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1473864 + 1473865.

It is an arithmetic number, because the mean of its divisors is an integer number (1473865).

2^2947729 is an apocalyptic number.

It is an amenable number.

2947729 is a deficient number, since it is larger than the sum of its proper divisors (1).

2947729 is an equidigital number, since it uses as much as digits as its factorization.

2947729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 40.

The square root of 2947729 is about 1716.8951627866. The cubic root of 2947729 is about 143.3824019248.

The spelling of 2947729 in words is "two million, nine hundred forty-seven thousand, seven hundred twenty-nine".