3861765 has 12 divisors (see below), whose sum is σ = 6693804. Its totient is φ = 2059584.

The previous prime is 3861751. The next prime is 3861811. The reversal of 3861765 is 5671683.

3861765 is a `hidden beast` number, since 38 + 617 + 6 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1602756 + 2259009 = 1266^2 + 1503^2 .

It is not a de Polignac number, because 3861765 - 2¹⁴ = 3845381 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42864 + ... + 42953.

It is an arithmetic number, because the mean of its divisors is an integer number (557817).

Almost surely, 2^3861765 is an apocalyptic number.

It is an amenable number.

3861765 is a deficient number, since it is larger than the sum of its proper divisors (2832039).

3861765 is a wasteful number, since it uses less digits than its factorization.

3861765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85828 (or 85825 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 3861765 is about 1965.1373997764. The cubic root of 3861765 is about 156.8900063950.

It can be divided in two parts, 3861 and 765, that multiplied together give a triangular number (2953665 = T₂₄₃₀).

The spelling of 3861765 in words is "three million, eight hundred sixty-one thousand, seven hundred sixty-five".