3921629 has 8 divisors (see below), whose sum is σ = 4064472. Its totient is φ = 3781440.

The previous prime is 3921601. The next prime is 3921637. The reversal of 3921629 is 9261293.

It can be written as a sum of positive squares in 4 ways, for example, as 28900 + 3892729 = 170^2 + 1973^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3921629 - 2²⁰ = 2873053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3921595 and 3921604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3921649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2627 + ... + 3839.

It is an arithmetic number, because the mean of its divisors is an integer number (508059).

Almost surely, 2^3921629 is an apocalyptic number.

It is an amenable number.

3921629 is a deficient number, since it is larger than the sum of its proper divisors (142843).

3921629 is a wasteful number, since it uses less digits than its factorization.

3921629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1327.

The product of its digits is 5832, while the sum is 32.

The square root of 3921629 is about 1980.3103292161. The cubic root of 3921629 is about 157.6965414016.

The spelling of 3921629 in words is "three million, nine hundred twenty-one thousand, six hundred twenty-nine".