1394821 has 2 divisors, whose sum is σ = 1394822. Its totient is φ = 1394820.

The previous prime is 1394777. The next prime is 1394831. The reversal of 1394821 is 1284931.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1368900 + 25921 = 1170^2 + 161^2 .

It is an emirp because it is prime and its reverse (1284931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1394821 - 2¹¹ = 1392773 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1394821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1394831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 697410 + 697411.

It is an arithmetic number, because the mean of its divisors is an integer number (697411).

2^1394821 is an apocalyptic number.

It is an amenable number.

1394821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1394821 is an equidigital number, since it uses as much as digits as its factorization.

1394821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 1394821 is about 1181.0254019283. The cubic root of 1394821 is about 111.7307787576.

The spelling of 1394821 in words is "one million, three hundred ninety-four thousand, eight hundred twenty-one".