3929521 has 2 divisors, whose sum is σ = 3929522. Its totient is φ = 3929520.

The previous prime is 3929509. The next prime is 3929531. The reversal of 3929521 is 1259293.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3381921 + 547600 = 1839^2 + 740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3929521 is a prime.

It is a super-2 number, since 2×3929521² = 30882270578882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3929501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1964760 + 1964761.

It is an arithmetic number, because the mean of its divisors is an integer number (1964761).

Almost surely, 2^3929521 is an apocalyptic number.

It is an amenable number.

3929521 is a deficient number, since it is larger than the sum of its proper divisors (1).

3929521 is an equidigital number, since it uses as much as digits as its factorization.

3929521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 31.

The square root of 3929521 is about 1982.3019447097. The cubic root of 3929521 is about 157.8022548850.

The spelling of 3929521 in words is "three million, nine hundred twenty-nine thousand, five hundred twenty-one".