2778393 has 4 divisors (see below), whose sum is σ = 3704528. Its totient is φ = 1852260.

The previous prime is 2778383. The next prime is 2778401. The reversal of 2778393 is 3938772.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2778393 - 2⁶ = 2778329 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2778323) 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, 463063 + ... + 463068.

It is an arithmetic number, because the mean of its divisors is an integer number (926132).

2^2778393 is an apocalyptic number.

It is an amenable number.

2778393 is a deficient number, since it is larger than the sum of its proper divisors (926135).

2778393 is an equidigital number, since it uses as much as digits as its factorization.

2778393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926134.

The product of its digits is 63504, while the sum is 39.

The square root of 2778393 is about 1666.8512231150. The cubic root of 2778393 is about 140.5824880879.

The spelling of 2778393 in words is "two million, seven hundred seventy-eight thousand, three hundred ninety-three".