3805890 has 64 divisors (see below), whose sum is σ = 10506240. Its totient is φ = 872640.

The previous prime is 3805889. The next prime is 3805897. The reversal of 3805890 is 985083.

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

It is not an unprimeable number, because it can be changed into a prime (3805897) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5967 + ... + 6573.

It is an arithmetic number, because the mean of its divisors is an integer number (164160).

Almost surely, 2^3805890 is an apocalyptic number.

3805890 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 3805890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5253120).

3805890 is an abundant number, since it is smaller than the sum of its proper divisors (6700350).

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

3805890 is a wasteful number, since it uses less digits than its factorization.

3805890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 3805890 is about 1950.8690371217. The cubic root of 3805890 is about 156.1296588056.

The spelling of 3805890 in words is "three million, eight hundred five thousand, eight hundred ninety".