2840455 has 4 divisors (see below), whose sum is σ = 3408552. Its totient is φ = 2272360.

The previous prime is 2840449. The next prime is 2840459. The reversal of 2840455 is 5540482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5540482 = 2 ⋅2770241.

It is not a de Polignac number, because 2840455 - 2³ = 2840447 is a prime.

It is a Duffinian number.

2840455 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2840459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284041 + ... + 284050.

It is an arithmetic number, because the mean of its divisors is an integer number (852138).

2^2840455 is an apocalyptic number.

2840455 is a deficient number, since it is larger than the sum of its proper divisors (568097).

2840455 is an equidigital number, since it uses as much as digits as its factorization.

2840455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568096.

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 2840455 is about 1685.3649456423. The cubic root of 2840455 is about 141.6215373360.

The spelling of 2840455 in words is "two million, eight hundred forty thousand, four hundred fifty-five".