1429721 has 2 divisors, whose sum is σ = 1429722. Its totient is φ = 1429720.

The previous prime is 1429697. The next prime is 1429733. The reversal of 1429721 is 1279241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 883600 + 546121 = 940^2 + 739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1429721 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1429741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 714860 + 714861.

It is an arithmetic number, because the mean of its divisors is an integer number (714861).

2^1429721 is an apocalyptic number.

It is an amenable number.

1429721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1429721 is an equidigital number, since it uses as much as digits as its factorization.

1429721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 26.

The square root of 1429721 is about 1195.7094128592. The cubic root of 1429721 is about 112.6549896670.

The spelling of 1429721 in words is "one million, four hundred twenty-nine thousand, seven hundred twenty-one".