1440322401 has 16 divisors (see below), whose sum is σ = 2225691648. Its totient is φ = 811448400.

The previous prime is 1440322369. The next prime is 1440322447. The reversal of 1440322401 is 1042230441.

It is not a de Polignac number, because 1440322401 - 2⁵ = 1440322369 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1440322451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 481515 + ... + 484496.

It is an arithmetic number, because the mean of its divisors is an integer number (139105728).

Almost surely, 2^1440322401 is an apocalyptic number.

It is an amenable number.

1440322401 is a deficient number, since it is larger than the sum of its proper divisors (785369247).

1440322401 is an equidigital number, since it uses as much as digits as its factorization.

1440322401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966092.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1440322401 is about 37951.5796904424. The cubic root of 1440322401 is about 1129.3275036343.

Adding to 1440322401 its reverse (1042230441), we get a palindrome (2482552842).

The spelling of 1440322401 in words is "one billion, four hundred forty million, three hundred twenty-two thousand, four hundred one".