1400821 has 2 divisors, whose sum is σ = 1400822. Its totient is φ = 1400820.

The previous prime is 1400809. The next prime is 1400863. The reversal of 1400821 is 1280041.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1347921 + 52900 = 1161^2 + 230^2 .

It is a cyclic number.

It is not a de Polignac number, because 1400821 - 2¹¹ = 1398773 is a prime.

1400821 is a lucky number.

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 1400795 and 1400804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1400801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700410 + 700411.

It is an arithmetic number, because the mean of its divisors is an integer number (700411).

2^1400821 is an apocalyptic number.

It is an amenable number.

1400821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1400821 is an equidigital number, since it uses as much as digits as its factorization.

1400821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1400821 is about 1183.5628415931. The cubic root of 1400821 is about 111.8907576402.

Adding to 1400821 its reverse (1280041), we get a palindrome (2680862).

The spelling of 1400821 in words is "one million, four hundred thousand, eight hundred twenty-one".