2122780 has 24 divisors (see below), whose sum is σ = 4863600. Its totient is φ = 771840.

The previous prime is 2122777. The next prime is 2122793. The reversal of 2122780 is 872212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4605 + ... + 5044.

It is an arithmetic number, because the mean of its divisors is an integer number (202650).

2^2122780 is an apocalyptic number.

2122780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2122780 is an abundant number, since it is smaller than the sum of its proper divisors (2740820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2122780 is a wasteful number, since it uses less digits than its factorization.

2122780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9669 (or 9667 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 2122780 is about 1456.9763210155. The cubic root of 2122780 is about 128.5192933831.

Adding to 2122780 its reverse (872212), we get a palindrome (2994992).

It can be divided in two parts, 212 and 2780, that added together give a palindrome (2992).

The spelling of 2122780 in words is "two million, one hundred twenty-two thousand, seven hundred eighty".