1326401243 has 4 divisors (see below), whose sum is σ = 1348882680. Its totient is φ = 1303919808.

The previous prime is 1326401239. The next prime is 1326401273. The reversal of 1326401243 is 3421046231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3421046231 = 73 ⋅46863647.

It is a cyclic number.

It is not a de Polignac number, because 1326401243 - 2² = 1326401239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1326401213) 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, 11240630 + ... + 11240747.

It is an arithmetic number, because the mean of its divisors is an integer number (337220670).

Almost surely, 2^1326401243 is an apocalyptic number.

1326401243 is a deficient number, since it is larger than the sum of its proper divisors (22481437).

1326401243 is an equidigital number, since it uses as much as digits as its factorization.

1326401243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22481436.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 1326401243 is about 36419.7919131892. The cubic root of 1326401243 is about 1098.7316629201.

Adding to 1326401243 its reverse (3421046231), we get a palindrome (4747447474).

The spelling of 1326401243 in words is "one billion, three hundred twenty-six million, four hundred one thousand, two hundred forty-three".