2780126 has 8 divisors (see below), whose sum is σ = 4211784. Its totient is φ = 1376200.

The previous prime is 2780123. The next prime is 2780131. The reversal of 2780126 is 6210872.

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

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2780095 and 2780104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2780123) 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, 6680 + ... + 7083.

It is an arithmetic number, because the mean of its divisors is an integer number (526473).

2^2780126 is an apocalyptic number.

2780126 is a deficient number, since it is larger than the sum of its proper divisors (1431658).

2780126 is a wasteful number, since it uses less digits than its factorization.

2780126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13866.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 2780126 is about 1667.3709845142. The cubic root of 2780126 is about 140.6117110735.

Adding to 2780126 its reverse (6210872), we get a palindrome (8990998).

The spelling of 2780126 in words is "two million, seven hundred eighty thousand, one hundred twenty-six".