2142780 has 48 divisors (see below), whose sum is σ = 6096384. Its totient is φ = 562240.

The previous prime is 2142773. The next prime is 2142793. The reversal of 2142780 is 872412.

It is a super-2 number, since 2×2142780² = 9183012256800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2142780.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4009 + ... + 4511.

It is an arithmetic number, because the mean of its divisors is an integer number (127008).

2^2142780 is an apocalyptic number.

2142780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2142780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3048192).

2142780 is an abundant number, since it is smaller than the sum of its proper divisors (3953604).

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

2142780 is a wasteful number, since it uses less digits than its factorization.

2142780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586 (or 584 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 2142780 is about 1463.8237598837. The cubic root of 2142780 is about 128.9216518420.

The spelling of 2142780 in words is "two million, one hundred forty-two thousand, seven hundred eighty".