2778369 has 16 divisors (see below), whose sum is σ = 4112640. Its totient is φ = 1654160.

The previous prime is 2778353. The next prime is 2778383. The reversal of 2778369 is 9638772.

It is a cyclic number.

It is not a de Polignac number, because 2778369 - 2⁴ = 2778353 is a prime.

It is a super-2 number, since 2×2778369² = 15438668600322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2778369.

It is not an unprimeable number, because it can be changed into a prime (2778329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1234 + ... + 2660.

It is an arithmetic number, because the mean of its divisors is an integer number (257040).

2^2778369 is an apocalyptic number.

It is an amenable number.

2778369 is a deficient number, since it is larger than the sum of its proper divisors (1334271).

2778369 is a wasteful number, since it uses less digits than its factorization.

2778369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500.

The product of its digits is 127008, while the sum is 42.

The square root of 2778369 is about 1666.8440238967. The cubic root of 2778369 is about 140.5820832988.

It can be divided in two parts, 277 and 8369, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 2778369 in words is "two million, seven hundred seventy-eight thousand, three hundred sixty-nine".