3866405 has 8 divisors (see below), whose sum is σ = 4884000. Its totient is φ = 2930256.

The previous prime is 3866399. The next prime is 3866419. The reversal of 3866405 is 5046683.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-3866405 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20255 + ... + 20444.

It is an arithmetic number, because the mean of its divisors is an integer number (610500).

Almost surely, 2^3866405 is an apocalyptic number.

It is an amenable number.

3866405 is a deficient number, since it is larger than the sum of its proper divisors (1017595).

3866405 is a wasteful number, since it uses less digits than its factorization.

3866405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40723.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 3866405 is about 1966.3176243934. The cubic root of 3866405 is about 156.9528169032.

The spelling of 3866405 in words is "three million, eight hundred sixty-six thousand, four hundred five".