3955729 has 4 divisors (see below), whose sum is σ = 3979584. Its totient is φ = 3931876.

The previous prime is 3955727. The next prime is 3955733. The reversal of 3955729 is 9275593.

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.

It is a cyclic number.

It is not a de Polignac number, because 3955729 - 2¹ = 3955727 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

3955729 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3955691 and 3955700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3955723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11677 + ... + 12010.

It is an arithmetic number, because the mean of its divisors is an integer number (994896).

Almost surely, 2^3955729 is an apocalyptic number.

It is an amenable number.

3955729 is a deficient number, since it is larger than the sum of its proper divisors (23855).

3955729 is a wasteful number, since it uses less digits than its factorization.

3955729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23854.

The product of its digits is 85050, while the sum is 40.

The square root of 3955729 is about 1988.9014555779. The cubic root of 3955729 is about 158.1522993377.

The spelling of 3955729 in words is "three million, nine hundred fifty-five thousand, seven hundred twenty-nine".