3866780 has 24 divisors (see below), whose sum is σ = 8157408. Its totient is φ = 1539648.

The previous prime is 3866777. The next prime is 3866791. The reversal of 3866780 is 876683.

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, 7697 + ... + 8183.

It is an arithmetic number, because the mean of its divisors is an integer number (339892).

Almost surely, 2^3866780 is an apocalyptic number.

It is an amenable number.

3866780 is an abundant number, since it is smaller than the sum of its proper divisors (4290628).

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

3866780 is a wasteful number, since it uses less digits than its factorization.

3866780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893 (or 891 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 3866780 is about 1966.4129779881. The cubic root of 3866780 is about 156.9578909883.

It can be divided in two parts, 3 and 866780, that multiplied together give a triangular number (2600340 = T₂₂₈₀).

The spelling of 3866780 in words is "three million, eight hundred sixty-six thousand, seven hundred eighty".