2781433 has 2 divisors, whose sum is σ = 2781434. Its totient is φ = 2781432.

The previous prime is 2781397. The next prime is 2781451. The reversal of 2781433 is 3341872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2471184 + 310249 = 1572^2 + 557^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2781433 is a prime.

2781433 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2781463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390716 + 1390717.

It is an arithmetic number, because the mean of its divisors is an integer number (1390717).

2^2781433 is an apocalyptic number.

It is an amenable number.

2781433 is a deficient number, since it is larger than the sum of its proper divisors (1).

2781433 is an equidigital number, since it uses as much as digits as its factorization.

2781433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 28.

The square root of 2781433 is about 1667.7628728329. The cubic root of 2781433 is about 140.6337425347.

It can be divided in two parts, 278 and 1433, that added together give a triangular number (1711 = T₅₈).

The spelling of 2781433 in words is "two million, seven hundred eighty-one thousand, four hundred thirty-three".