2780938 has 4 divisors (see below), whose sum is σ = 4171410. Its totient is φ = 1390468.

The previous prime is 2780933. The next prime is 2780951. The reversal of 2780938 is 8390872.

2780938 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 2152089 + 628849 = 1467^2 + 793^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2780897 and 2780906.

It is not an unprimeable number, because it can be changed into a prime (2780933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695233 + ... + 695236.

2^2780938 is an apocalyptic number.

2780938 is a deficient number, since it is larger than the sum of its proper divisors (1390472).

2780938 is a wasteful number, since it uses less digits than its factorization.

2780938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1390471.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 2780938 is about 1667.6144638375. The cubic root of 2780938 is about 140.6253993734.

The spelling of 2780938 in words is "two million, seven hundred eighty thousand, nine hundred thirty-eight".