2785906 has 4 divisors (see below), whose sum is σ = 4178862. Its totient is φ = 1392952.

The previous prime is 2785903. The next prime is 2785907. The reversal of 2785906 is 6095872.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2692881 + 93025 = 1641^2 + 305^2 .

It is a super-2 number, since 2×2785906² = 15522544481672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2785901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696475 + ... + 696478.

2^2785906 is an apocalyptic number.

2785906 is a deficient number, since it is larger than the sum of its proper divisors (1392956).

2785906 is a wasteful number, since it uses less digits than its factorization.

2785906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392955.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 2785906 is about 1669.1033521026. The cubic root of 2785906 is about 140.7090895259.

The spelling of 2785906 in words is "two million, seven hundred eighty-five thousand, nine hundred six".