3865780 has 24 divisors (see below), whose sum is σ = 8158752. Its totient is φ = 1538592.

The previous prime is 3865777. The next prime is 3865801. The reversal of 3865780 is 875683.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam 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, 5319 + ... + 6001.

It is an arithmetic number, because the mean of its divisors is an integer number (339948).

Almost surely, 2^3865780 is an apocalyptic number.

It is an amenable number.

3865780 is an abundant number, since it is smaller than the sum of its proper divisors (4292972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3865780 is a wasteful number, since it uses less digits than its factorization.

3865780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975 (or 973 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 3865780 is about 1966.1586914591. The cubic root of 3865780 is about 156.9443593657.

The spelling of 3865780 in words is "three million, eight hundred sixty-five thousand, seven hundred eighty".