3865280 has 56 divisors (see below), whose sum is σ = 9436608. Its totient is φ = 1507328.

The previous prime is 3865247. The next prime is 3865283. The reversal of 3865280 is 825683.

It is a hoax number, since the sum of its digits (32) 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 (32).

It is a d-powerful number, because it can be written as 3⁷ + 8 + 6⁸ + 5⁷ + 2¹³ + 8⁷ + 0 .

It is not an unprimeable number, because it can be changed into a prime (3865283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14912 + ... + 15168.

Almost surely, 2^3865280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3865280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4718304).

3865280 is an abundant number, since it is smaller than the sum of its proper divisors (5571328).

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

3865280 is a wasteful number, since it uses less digits than its factorization.

3865280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 3865280 is about 1966.0315358610. The cubic root of 3865280 is about 156.9375926792.

The spelling of 3865280 in words is "three million, eight hundred sixty-five thousand, two hundred eighty".