1778241 has 4 divisors (see below), whose sum is σ = 2370992. Its totient is φ = 1185492.

The previous prime is 1778239. The next prime is 1778243. The reversal of 1778241 is 1428771.

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 an interprime number because it is at equal distance from previous prime (1778239) and next prime (1778243).

It is not a de Polignac number, because 1778241 - 2¹ = 1778239 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1778199 and 1778208.

It is not an unprimeable number, because it can be changed into a prime (1778243) 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, 296371 + ... + 296376.

It is an arithmetic number, because the mean of its divisors is an integer number (592748).

2^1778241 is an apocalyptic number.

It is an amenable number.

1778241 is a deficient number, since it is larger than the sum of its proper divisors (592751).

1778241 is an equidigital number, since it uses as much as digits as its factorization.

1778241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592750.

The product of its digits is 3136, while the sum is 30.

The square root of 1778241 is about 1333.5070303527. The cubic root of 1778241 is about 121.1518935747.

The spelling of 1778241 in words is "one million, seven hundred seventy-eight thousand, two hundred forty-one".