1440001 has 4 divisors (see below), whose sum is σ = 1444612. Its totient is φ = 1435392.

The previous prime is 1439989. The next prime is 1440011. The reversal of 1440001 is 1000441.

It is a Cunningham number, because it is equal to 1200²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 389376 + 1050625 = 624^2 + 1025^2 .

It is a cyclic number.

It is not a de Polignac number, because 1440001 - 2⁵ = 1439969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1440001.

It is not an unprimeable number, because it can be changed into a prime (1440011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1800 + ... + 2473.

It is an arithmetic number, because the mean of its divisors is an integer number (361153).

2^1440001 is an apocalyptic number.

It is an amenable number.

1440001 is a deficient number, since it is larger than the sum of its proper divisors (4611).

1440001 is an equidigital number, since it uses as much as digits as its factorization.

1440001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4610.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1440001 is about 1200.0004166666. Note that the first 3 decimals coincide. The cubic root of 1440001 is about 112.9243496056.

Adding to 1440001 its reverse (1000441), we get a palindrome (2440442).

The spelling of 1440001 in words is "one million, four hundred forty thousand, one".