1438009 has 2 divisors, whose sum is σ = 1438010. Its totient is φ = 1438008.

The previous prime is 1438001. The next prime is 1438033. The reversal of 1438009 is 9008341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1081600 + 356409 = 1040^2 + 597^2 .

It is a cyclic number.

It is not a de Polignac number, because 1438009 - 2³ = 1438001 is a prime.

It is not a weakly prime, because it can be changed into another prime (1438001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719004 + 719005.

It is an arithmetic number, because the mean of its divisors is an integer number (719005).

2^1438009 is an apocalyptic number.

It is an amenable number.

1438009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438009 is an equidigital number, since it uses as much as digits as its factorization.

1438009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1438009 is about 1199.1701297147. The cubic root of 1438009 is about 112.8722549406.

The spelling of 1438009 in words is "one million, four hundred thirty-eight thousand, nine".