1440320402 has 4 divisors (see below), whose sum is σ = 2160480606. Its totient is φ = 720160200.

The previous prime is 1440320381. The next prime is 1440320407. The reversal of 1440320402 is 2040230441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2040230441 = 137 ⋅14892193.

It can be written as a sum of positive squares in only one way, i.e., 1306894801 + 133425601 = 36151^2 + 11551^2 .

It is not an unprimeable number, because it can be changed into a prime (1440320407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360080099 + ... + 360080102.

Almost surely, 2^1440320402 is an apocalyptic number.

1440320402 is a deficient number, since it is larger than the sum of its proper divisors (720160204).

1440320402 is an equidigital number, since it uses as much as digits as its factorization.

1440320402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720160203.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 1440320402 is about 37951.5533542436. The cubic root of 1440320402 is about 1129.3269811757.

Adding to 1440320402 its reverse (2040230441), we get a palindrome (3480550843).

The spelling of 1440320402 in words is "one billion, four hundred forty million, three hundred twenty thousand, four hundred two".