2806390 has 8 divisors (see below), whose sum is σ = 5051520. Its totient is φ = 1122552.

The previous prime is 2806387. The next prime is 2806439. The reversal of 2806390 is 936082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140310 + ... + 140329.

It is an arithmetic number, because the mean of its divisors is an integer number (631440).

2^2806390 is an apocalyptic number.

2806390 is a deficient number, since it is larger than the sum of its proper divisors (2245130).

2806390 is a wasteful number, since it uses less digits than its factorization.

2806390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280646.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 2806390 is about 1675.2283426447. The cubic root of 2806390 is about 141.0531127975.

It can be divided in two parts, 280 and 6390, that added together give a triangular number (6670 = T₁₁₅).

The spelling of 2806390 in words is "two million, eight hundred six thousand, three hundred ninety".