3865980 has 24 divisors (see below), whose sum is σ = 10824912. Its totient is φ = 1030912.

The previous prime is 3865969. The next prime is 3865991. The reversal of 3865980 is 895683.

It is an interprime number because it is at equal distance from previous prime (3865969) and next prime (3865991).

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, 32157 + ... + 32276.

It is an arithmetic number, because the mean of its divisors is an integer number (451038).

Almost surely, 2^3865980 is an apocalyptic number.

3865980 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3865980 is an abundant number, since it is smaller than the sum of its proper divisors (6958932).

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

3865980 is a wasteful number, since it uses less digits than its factorization.

3865980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64445 (or 64443 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 3865980 is about 1966.2095513958. The cubic root of 3865980 is about 156.9470658769.

The spelling of 3865980 in words is "three million, eight hundred sixty-five thousand, nine hundred eighty".