3994729 has 2 divisors, whose sum is σ = 3994730. Its totient is φ = 3994728.

The previous prime is 3994723. The next prime is 3994733. The reversal of 3994729 is 9274993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2729104 + 1265625 = 1652^2 + 1125^2 .

It is a cyclic number.

It is not a de Polignac number, because 3994729 - 2¹³ = 3986537 is a prime.

It is not a weakly prime, because it can be changed into another prime (3994723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1997364 + 1997365.

It is an arithmetic number, because the mean of its divisors is an integer number (1997365).

Almost surely, 2^3994729 is an apocalyptic number.

It is an amenable number.

3994729 is a deficient number, since it is larger than the sum of its proper divisors (1).

3994729 is an equidigital number, since it uses as much as digits as its factorization.

3994729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 43.

The square root of 3994729 is about 1998.6818155975. The cubic root of 3994729 is about 158.6703479558.

The spelling of 3994729 in words is "three million, nine hundred ninety-four thousand, seven hundred twenty-nine".