1400689 has 2 divisors, whose sum is σ = 1400690. Its totient is φ = 1400688.

The previous prime is 1400687. The next prime is 1400701. The reversal of 1400689 is 9860041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1000000 + 400689 = 1000^2 + 633^2 .

It is a cyclic number.

It is not a de Polignac number, because 1400689 - 2¹ = 1400687 is a prime.

Together with 1400687, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1400687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700344 + 700345.

It is an arithmetic number, because the mean of its divisors is an integer number (700345).

2^1400689 is an apocalyptic number.

It is an amenable number.

1400689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1400689 is an equidigital number, since it uses as much as digits as its factorization.

1400689 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1400689 is about 1183.5070764469. The cubic root of 1400689 is about 111.8872430241.

The spelling of 1400689 in words is "one million, four hundred thousand, six hundred eighty-nine".