1778341 has 2 divisors, whose sum is σ = 1778342. Its totient is φ = 1778340.

The previous prime is 1778323. The next prime is 1778347. The reversal of 1778341 is 1438771.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1766241 + 12100 = 1329^2 + 110^2 .

It is an emirp because it is prime and its reverse (1438771) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1778341 - 2⁷ = 1778213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1778347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 889170 + 889171.

It is an arithmetic number, because the mean of its divisors is an integer number (889171).

2^1778341 is an apocalyptic number.

It is an amenable number.

1778341 is a deficient number, since it is larger than the sum of its proper divisors (1).

1778341 is an equidigital number, since it uses as much as digits as its factorization.

1778341 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704, while the sum is 31.

The square root of 1778341 is about 1333.5445249410. The cubic root of 1778341 is about 121.1541645384.

The spelling of 1778341 in words is "one million, seven hundred seventy-eight thousand, three hundred forty-one".