1391849 has 2 divisors, whose sum is σ = 1391850. Its totient is φ = 1391848.

The previous prime is 1391779. The next prime is 1391861. The reversal of 1391849 is 9481931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1081600 + 310249 = 1040^2 + 557^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391849 - 2¹⁶ = 1326313 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1391899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695924 + 695925.

It is an arithmetic number, because the mean of its divisors is an integer number (695925).

2^1391849 is an apocalyptic number.

It is an amenable number.

1391849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391849 is an equidigital number, since it uses as much as digits as its factorization.

1391849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 35.

The square root of 1391849 is about 1179.7665023215. The cubic root of 1391849 is about 111.6513659390.

The spelling of 1391849 in words is "one million, three hundred ninety-one thousand, eight hundred forty-nine".