2778340403 has 2 divisors, whose sum is σ = 2778340404. Its totient is φ = 2778340402.

The previous prime is 2778340399. The next prime is 2778340457. The reversal of 2778340403 is 3040438772.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2778340403 - 2² = 2778340399 is a prime.

It is not a weakly prime, because it can be changed into another prime (2778340003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389170201 + 1389170202.

It is an arithmetic number, because the mean of its divisors is an integer number (1389170202).

Almost surely, 2^2778340403 is an apocalyptic number.

2778340403 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778340403 is an equidigital number, since it uses as much as digits as its factorization.

2778340403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 38.

The square root of 2778340403 is about 52709.9649307415. The cubic root of 2778340403 is about 1405.8160097274.

It can be divided in two parts, 27783 and 40403, that added together give a palindrome (68186).

The spelling of 2778340403 in words is "two billion, seven hundred seventy-eight million, three hundred forty thousand, four hundred three".