3506391 has 18 divisors (see below), whose sum is σ = 5892432. Its totient is φ = 2003400.

The previous prime is 3506387. The next prime is 3506401. The reversal of 3506391 is 1936053.

3506391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3506391 - 2² = 3506387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3506351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3535 + ... + 4416.

Almost surely, 2^3506391 is an apocalyptic number.

3506391 is a deficient number, since it is larger than the sum of its proper divisors (2386041).

3506391 is a wasteful number, since it uses less digits than its factorization.

3506391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7971 (or 7961 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 27.

The square root of 3506391 is about 1872.5359809627. The cubic root of 3506391 is about 151.9218059261.

The spelling of 3506391 in words is "three million, five hundred six thousand, three hundred ninety-one".