1345440403 has 4 divisors (see below), whose sum is σ = 1345678528. Its totient is φ = 1345202280.

The previous prime is 1345440359. The next prime is 1345440427. The reversal of 1345440403 is 3040445431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3040445431 = 239 ⋅12721529.

It is a cyclic number.

It is not a de Polignac number, because 1345440403 - 2²¹ = 1343343251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1345440463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110376 + ... + 121957.

It is an arithmetic number, because the mean of its divisors is an integer number (336419632).

Almost surely, 2^1345440403 is an apocalyptic number.

1345440403 is a deficient number, since it is larger than the sum of its proper divisors (238125).

1345440403 is an equidigital number, since it uses as much as digits as its factorization.

1345440403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238124.

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 1345440403 is about 36680.2454053950. The cubic root of 1345440403 is about 1103.9637721234.

Adding to 1345440403 its reverse (3040445431), we get a palindrome (4385885834).

The spelling of 1345440403 in words is "one billion, three hundred forty-five million, four hundred forty thousand, four hundred three".