1320403 has 6 divisors (see below), whose sum is σ = 1536036. Its totient is φ = 1131732.

The previous prime is 1320391. The next prime is 1320409. The reversal of 1320403 is 3040231.

It is not a de Polignac number, because 1320403 - 2¹³ = 1312211 is a prime.

It is a Duffinian number.

1320403 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1320409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13425 + ... + 13522.

It is an arithmetic number, because the mean of its divisors is an integer number (256006).

2^1320403 is an apocalyptic number.

1320403 is a deficient number, since it is larger than the sum of its proper divisors (215633).

1320403 is an equidigital number, since it uses as much as digits as its factorization.

1320403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26961 (or 26954 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 1320403 is about 1149.0878991618. The cubic root of 1320403 is about 109.7072934332.

Adding to 1320403 its reverse (3040231), we get a palindrome (4360634).

The spelling of 1320403 in words is "one million, three hundred twenty thousand, four hundred three".