3861405 has 16 divisors (see below), whose sum is σ = 6864960. Its totient is φ = 2059344.

The previous prime is 3861383. The next prime is 3861413. The reversal of 3861405 is 5041683.

It is not a de Polignac number, because 3861405 - 2⁹ = 3860893 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14167 + ... + 14436.

It is an arithmetic number, because the mean of its divisors is an integer number (429060).

Almost surely, 2^3861405 is an apocalyptic number.

It is an amenable number.

3861405 is a deficient number, since it is larger than the sum of its proper divisors (3003555).

3861405 is a wasteful number, since it uses less digits than its factorization.

3861405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28617 (or 28611 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 3861405 is about 1965.0458009929. The cubic root of 3861405 is about 156.8851310632.

The spelling of 3861405 in words is "three million, eight hundred sixty-one thousand, four hundred five".