3946729 has 2 divisors, whose sum is σ = 3946730. Its totient is φ = 3946728.

The previous prime is 3946727. The next prime is 3946739. The reversal of 3946729 is 9276493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2647129 + 1299600 = 1627^2 + 1140^2 .

It is a cyclic number.

It is not a de Polignac number, because 3946729 - 2¹ = 3946727 is a prime.

Together with 3946727, it forms a pair of twin primes.

3946729 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3946691 and 3946700.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3946721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1973364 + 1973365.

It is an arithmetic number, because the mean of its divisors is an integer number (1973365).

Almost surely, 2^3946729 is an apocalyptic number.

It is an amenable number.

3946729 is a deficient number, since it is larger than the sum of its proper divisors (1).

3946729 is an equidigital number, since it uses as much as digits as its factorization.

3946729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 40.

The square root of 3946729 is about 1986.6376116444. The cubic root of 3946729 is about 158.0322665501.

The spelling of 3946729 in words is "three million, nine hundred forty-six thousand, seven hundred twenty-nine".