1778113 has 4 divisors (see below), whose sum is σ = 1804720. Its totient is φ = 1751508.

The previous prime is 1778111. The next prime is 1778137. The reversal of 1778113 is 3118771.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3118771 = 1097 ⋅2843.

It is a cyclic number.

It is not a de Polignac number, because 1778113 - 2¹ = 1778111 is a prime.

It is a Duffinian number.

1778113 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1778111) 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, 13203 + ... + 13336.

It is an arithmetic number, because the mean of its divisors is an integer number (451180).

2^1778113 is an apocalyptic number.

It is an amenable number.

1778113 is a deficient number, since it is larger than the sum of its proper divisors (26607).

1778113 is an equidigital number, since it uses as much as digits as its factorization.

1778113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26606.

The product of its digits is 1176, while the sum is 28.

The square root of 1778113 is about 1333.4590357413. The cubic root of 1778113 is about 121.1489866170.

It can be divided in two parts, 1778 and 113, that added together give a triangular number (1891 = T₆₁).

The spelling of 1778113 in words is "one million, seven hundred seventy-eight thousand, one hundred thirteen".