2778459 has 4 divisors (see below), whose sum is σ = 3704616. Its totient is φ = 1852304.

The previous prime is 2778439. The next prime is 2778467. The reversal of 2778459 is 9548772.

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

It is a cyclic number.

It is not a de Polignac number, because 2778459 - 2⁸ = 2778203 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 2778459.

It is not an unprimeable number, because it can be changed into a prime (2778439) 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, 463074 + ... + 463079.

It is an arithmetic number, because the mean of its divisors is an integer number (926154).

2^2778459 is an apocalyptic number.

2778459 is a deficient number, since it is larger than the sum of its proper divisors (926157).

2778459 is an equidigital number, since it uses as much as digits as its factorization.

2778459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926156.

The product of its digits is 141120, while the sum is 42.

The square root of 2778459 is about 1666.8710208051. The cubic root of 2778459 is about 140.5836012459.

The spelling of 2778459 in words is "two million, seven hundred seventy-eight thousand, four hundred fifty-nine".