2781937 has 2 divisors, whose sum is σ = 2781938. Its totient is φ = 2781936.

The previous prime is 2781929. The next prime is 2781949. The reversal of 2781937 is 7391872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2742336 + 39601 = 1656^2 + 199^2 .

It is a cyclic number.

It is not a de Polignac number, because 2781937 - 2³ = 2781929 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 2781896 and 2781905.

It is not a weakly prime, because it can be changed into another prime (2781637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390968 + 1390969.

It is an arithmetic number, because the mean of its divisors is an integer number (1390969).

2^2781937 is an apocalyptic number.

It is an amenable number.

2781937 is a deficient number, since it is larger than the sum of its proper divisors (1).

2781937 is an equidigital number, since it uses as much as digits as its factorization.

2781937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 37.

The square root of 2781937 is about 1667.9139666062. The cubic root of 2781937 is about 140.6422363729.

It can be divided in two parts, 278193 and 7, that multiplied together give a triangular number (1947351 = T₁₉₇₃).

The spelling of 2781937 in words is "two million, seven hundred eighty-one thousand, nine hundred thirty-seven".