3947129 has 4 divisors (see below), whose sum is σ = 3969360. Its totient is φ = 3924900.

The previous prime is 3947113. The next prime is 3947131. The reversal of 3947129 is 9217493.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9217493 = 151 ⋅61043.

It is a cyclic number.

It is not a de Polignac number, because 3947129 - 2⁴ = 3947113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3947189) 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 in 3 ways as a sum of consecutive naturals, for example, 10847 + ... + 11204.

It is an arithmetic number, because the mean of its divisors is an integer number (992340).

Almost surely, 2^3947129 is an apocalyptic number.

It is an amenable number.

3947129 is a deficient number, since it is larger than the sum of its proper divisors (22231).

3947129 is a wasteful number, since it uses less digits than its factorization.

3947129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22230.

The product of its digits is 13608, while the sum is 35.

The square root of 3947129 is about 1986.7382817070. The cubic root of 3947129 is about 158.0376052134.

The spelling of 3947129 in words is "three million, nine hundred forty-seven thousand, one hundred twenty-nine".