3866520 has 64 divisors (see below), whose sum is σ = 13259520. Its totient is φ = 883584.

The previous prime is 3866479. The next prime is 3866543. The reversal of 3866520 is 256683.

It is a hoax number, since the sum of its digits (30) 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 (30).

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, 1462 + ... + 3141.

It is an arithmetic number, because the mean of its divisors is an integer number (207180).

Almost surely, 2^3866520 is an apocalyptic number.

3866520 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3866520 is an abundant number, since it is smaller than the sum of its proper divisors (9393000).

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

3866520 is a wasteful number, since it uses less digits than its factorization.

3866520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4624 (or 4620 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 3866520 is about 1966.3468666540. The cubic root of 3866520 is about 156.9543729909.

The spelling of 3866520 in words is "three million, eight hundred sixty-six thousand, five hundred twenty".