3905243 has 4 divisors (see below), whose sum is σ = 3927240. Its totient is φ = 3883248.

The previous prime is 3905221. The next prime is 3905263. The reversal of 3905243 is 3425093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3425093 = 7 ⋅489299.

It is a cyclic number.

It is not a de Polignac number, because 3905243 - 2¹² = 3901147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3905263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10730 + ... + 11087.

It is an arithmetic number, because the mean of its divisors is an integer number (981810).

Almost surely, 2^3905243 is an apocalyptic number.

3905243 is a deficient number, since it is larger than the sum of its proper divisors (21997).

3905243 is a wasteful number, since it uses less digits than its factorization.

3905243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21996.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 3905243 is about 1976.1687680965. The cubic root of 3905243 is about 157.4765968418.

The spelling of 3905243 in words is "three million, nine hundred five thousand, two hundred forty-three".