3908991 has 8 divisors (see below), whose sum is σ = 5231664. Its totient is φ = 2596160.

The previous prime is 3908921. The next prime is 3909019. The reversal of 3908991 is 1998093.

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 3908991 - 2¹⁴ = 3892607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3908911) 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, 1476 + ... + 3161.

It is an arithmetic number, because the mean of its divisors is an integer number (653958).

Almost surely, 2^3908991 is an apocalyptic number.

3908991 is a deficient number, since it is larger than the sum of its proper divisors (1322673).

3908991 is a wasteful number, since it uses less digits than its factorization.

3908991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4921.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 3908991 is about 1977.1168402500. The cubic root of 3908991 is about 157.5269593559.

The spelling of 3908991 in words is "three million, nine hundred eight thousand, nine hundred ninety-one".