3934209 has 4 divisors (see below), whose sum is σ = 5245616. Its totient is φ = 2622804.

The previous prime is 3934207. The next prime is 3934261. The reversal of 3934209 is 9024393.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3934209 - 2¹ = 3934207 is a prime.

It is a D-number.

It is a Duffinian number.

3934209 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3934201) 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, 655699 + ... + 655704.

It is an arithmetic number, because the mean of its divisors is an integer number (1311404).

It is a Proth number, since it is equal to 1921 ⋅ 2¹¹ + 1 and 1921 < 2¹¹.

Almost surely, 2^3934209 is an apocalyptic number.

It is an amenable number.

3934209 is a deficient number, since it is larger than the sum of its proper divisors (1311407).

3934209 is a wasteful number, since it uses less digits than its factorization.

3934209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311406.

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 3934209 is about 1983.4840558976. The cubic root of 3934209 is about 157.8649837330.

The spelling of 3934209 in words is "three million, nine hundred thirty-four thousand, two hundred nine".