1438993 has 2 divisors, whose sum is σ = 1438994. Its totient is φ = 1438992.

The previous prime is 1438991. The next prime is 1439017. The reversal of 1438993 is 3998341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 944784 + 494209 = 972^2 + 703^2 .

It is a cyclic number.

It is not a de Polignac number, because 1438993 - 2¹ = 1438991 is a prime.

Together with 1438991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1438991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719496 + 719497.

It is an arithmetic number, because the mean of its divisors is an integer number (719497).

2^1438993 is an apocalyptic number.

It is an amenable number.

1438993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438993 is an equidigital number, since it uses as much as digits as its factorization.

1438993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 37.

The square root of 1438993 is about 1199.5803432868. The cubic root of 1438993 is about 112.8979944585.

The spelling of 1438993 in words is "one million, four hundred thirty-eight thousand, nine hundred ninety-three".