3865290 has 128 divisors (see below), whose sum is σ = 11757312. Its totient is φ = 798720.

The previous prime is 3865289. The next prime is 3865321. The reversal of 3865290 is 925683.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 72904 + ... + 72956.

It is an arithmetic number, because the mean of its divisors is an integer number (91854).

Almost surely, 2^3865290 is an apocalyptic number.

3865290 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 3865290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5878656).

3865290 is an abundant number, since it is smaller than the sum of its proper divisors (7892022).

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

3865290 is a wasteful number, since it uses less digits than its factorization.

3865290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 3865290 is about 1966.0340790536. The cubic root of 3865290 is about 156.9377280187.

The spelling of 3865290 in words is "three million, eight hundred sixty-five thousand, two hundred ninety".