2778523 has 6 divisors (see below), whose sum is σ = 3054212. Its totient is φ = 2525820.

The previous prime is 2778521. The next prime is 2778527. The reversal of 2778523 is 3258772.

It is not a de Polignac number, because 2778523 - 2¹ = 2778521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2778521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11361 + ... + 11602.

2^2778523 is an apocalyptic number.

2778523 is a deficient number, since it is larger than the sum of its proper divisors (275689).

2778523 is a wasteful number, since it uses less digits than its factorization.

2778523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22985 (or 22974 counting only the distinct ones).

The product of its digits is 23520, while the sum is 34.

The square root of 2778523 is about 1666.8902183407. The cubic root of 2778523 is about 140.5846806549.

Subtracting 2778523 from its reverse (3258772), we obtain a square (480249 = 693²).

The spelling of 2778523 in words is "two million, seven hundred seventy-eight thousand, five hundred twenty-three".