3908521 has 8 divisors (see below), whose sum is σ = 4161024. Its totient is φ = 3658560.

The previous prime is 3908503. The next prime is 3908537. The reversal of 3908521 is 1258093.

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 3908521 - 2⁷ = 3908393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3908521.

It is not an unprimeable number, because it can be changed into a prime (3908501) 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 7 ways as a sum of consecutive naturals, for example, 3276 + ... + 4306.

It is an arithmetic number, because the mean of its divisors is an integer number (520128).

Almost surely, 2^3908521 is an apocalyptic number.

It is an amenable number.

3908521 is a deficient number, since it is larger than the sum of its proper divisors (252503).

3908521 is a wasteful number, since it uses less digits than its factorization.

3908521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 3908521 is about 1976.9979767314. The cubic root of 3908521 is about 157.5206456517.

It can be divided in two parts, 390 and 8521, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 3908521 in words is "three million, nine hundred eight thousand, five hundred twenty-one".