1378441 has 2 divisors, whose sum is σ = 1378442. Its totient is φ = 1378440.
The previous prime is 1378439. The next prime is 1378499. The reversal of 1378441 is 1448731.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 942841 + 435600 = 971^2 + 660^2 .
It is a cyclic number.
It is not a de Polignac number, because 1378441 - 21 = 1378439 is a prime.
Together with 1378439, it forms a pair of twin primes.
1378441 is a lucky number.
It is not a weakly prime, because it can be changed into another prime (1378141) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689220 + 689221.
It is an arithmetic number, because the mean of its divisors is an integer number (689221).
21378441 is an apocalyptic number.
It is an amenable number.
1378441 is a deficient number, since it is larger than the sum of its proper divisors (1).
1378441 is an equidigital number, since it uses as much as digits as its factorization.
1378441 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 2688, while the sum is 28.
The square root of 1378441 is about 1174.0702704694. The cubic root of 1378441 is about 111.2916874448.
The spelling of 1378441 in words is "one million, three hundred seventy-eight thousand, four hundred forty-one".
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