3994429 has 2 divisors, whose sum is σ = 3994430. Its totient is φ = 3994428.

The previous prime is 3994421. The next prime is 3994453. The reversal of 3994429 is 9244993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2566404 + 1428025 = 1602^2 + 1195^2 .

It is an emirp because it is prime and its reverse (9244993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3994429 - 2³ = 3994421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3994391 and 3994400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3994421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1997214 + 1997215.

It is an arithmetic number, because the mean of its divisors is an integer number (1997215).

Almost surely, 2^3994429 is an apocalyptic number.

It is an amenable number.

3994429 is a deficient number, since it is larger than the sum of its proper divisors (1).

3994429 is an equidigital number, since it uses as much as digits as its factorization.

3994429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 40.

The square root of 3994429 is about 1998.6067647239. The cubic root of 3994429 is about 158.6663758635. Note that the first 3 decimals are identical.

The spelling of 3994429 in words is "three million, nine hundred ninety-four thousand, four hundred twenty-nine".