2120455 has 4 divisors (see below), whose sum is σ = 2544552. Its totient is φ = 1696360.

The previous prime is 2120453. The next prime is 2120473. The reversal of 2120455 is 5540212.

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

It is not a de Polignac number, because 2120455 - 2¹ = 2120453 is a prime.

It is a Duffinian number.

2120455 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120453) 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, 212041 + ... + 212050.

It is an arithmetic number, because the mean of its divisors is an integer number (636138).

2^2120455 is an apocalyptic number.

2120455 is a deficient number, since it is larger than the sum of its proper divisors (424097).

2120455 is an equidigital number, since it uses as much as digits as its factorization.

2120455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424096.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 2120455 is about 1456.1782171149. The cubic root of 2120455 is about 128.4723554818.

Adding to 2120455 its reverse (5540212), we get a palindrome (7660667).

The spelling of 2120455 in words is "two million, one hundred twenty thousand, four hundred fifty-five".