2778431 has 4 divisors (see below), whose sum is σ = 2785200. Its totient is φ = 2771664.

The previous prime is 2778421. The next prime is 2778439. The reversal of 2778431 is 1348772.

It is a happy number.

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 2778431 - 2¹⁰ = 2777407 is a prime.

It is a super-4 number, since 4×2778431⁴ (a number of 27 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778439) 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, 2726 + ... + 3603.

It is an arithmetic number, because the mean of its divisors is an integer number (696300).

2^2778431 is an apocalyptic number.

2778431 is a deficient number, since it is larger than the sum of its proper divisors (6769).

2778431 is an equidigital number, since it uses as much as digits as its factorization.

2778431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6768.

The product of its digits is 9408, while the sum is 32.

The square root of 2778431 is about 1666.8626218138. The cubic root of 2778431 is about 140.5831289992.

The spelling of 2778431 in words is "two million, seven hundred seventy-eight thousand, four hundred thirty-one".