2478779 has 4 divisors (see below), whose sum is σ = 2586576. Its totient is φ = 2370984.

The previous prime is 2478761. The next prime is 2478793. The reversal of 2478779 is 9778742.

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 2478779 - 2⁸ = 2478523 is a prime.

It is a super-2 number, since 2×2478779² = 12288690661682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2478709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53864 + ... + 53909.

It is an arithmetic number, because the mean of its divisors is an integer number (646644).

2^2478779 is an apocalyptic number.

2478779 is a deficient number, since it is larger than the sum of its proper divisors (107797).

2478779 is a wasteful number, since it uses less digits than its factorization.

2478779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107796.

The product of its digits is 197568, while the sum is 44.

The square root of 2478779 is about 1574.4138591870. The cubic root of 2478779 is about 135.3357714030.

The spelling of 2478779 in words is "two million, four hundred seventy-eight thousand, seven hundred seventy-nine".