2785642 has 8 divisors (see below), whose sum is σ = 4191876. Its totient is φ = 1388352.

The previous prime is 2785639. The next prime is 2785649. The reversal of 2785642 is 2465872.

It can be written as a sum of positive squares in 2 ways, for example, as 2785561 + 81 = 1669^2 + 9^2 .

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

It is a d-powerful number, because it can be written as 2⁹ + 7⁷ + 8 + 5⁹ + 6 + 4⁴ + 2¹³ .

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 2785598 and 2785607.

It is not an unprimeable number, because it can be changed into a prime (2785649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1393 + ... + 2740.

2^2785642 is an apocalyptic number.

2785642 is a deficient number, since it is larger than the sum of its proper divisors (1406234).

2785642 is a wasteful number, since it uses less digits than its factorization.

2785642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4472.

The product of its digits is 26880, while the sum is 34.

The square root of 2785642 is about 1669.0242658512. The cubic root of 2785642 is about 140.7046447273.

The spelling of 2785642 in words is "two million, seven hundred eighty-five thousand, six hundred forty-two".