3906215 has 4 divisors (see below), whose sum is σ = 4687464. Its totient is φ = 3124968.

The previous prime is 3906187. The next prime is 3906247. The reversal of 3906215 is 5126093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5126093 = 7 ⋅732299.

It is a cyclic number.

It is not a de Polignac number, because 3906215 - 2⁶ = 3906151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390617 + ... + 390626.

It is an arithmetic number, because the mean of its divisors is an integer number (1171866).

Almost surely, 2^3906215 is an apocalyptic number.

3906215 is a deficient number, since it is larger than the sum of its proper divisors (781249).

3906215 is an equidigital number, since it uses as much as digits as its factorization.

3906215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781248.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 3906215 is about 1976.4146832080. The cubic root of 3906215 is about 157.4896608649.

The spelling of 3906215 in words is "three million, nine hundred six thousand, two hundred fifteen".