1326695989 has 4 divisors (see below), whose sum is σ = 1345381920. Its totient is φ = 1308010060.

The previous prime is 1326695977. The next prime is 1326696017. The reversal of 1326695989 is 9895966231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9895966231 = 47 ⋅210552473.

It is a cyclic number.

It is not a de Polignac number, because 1326695989 - 2¹⁹ = 1326171701 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1326695969) 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, 9342859 + ... + 9343000.

It is an arithmetic number, because the mean of its divisors is an integer number (336345480).

Almost surely, 2^1326695989 is an apocalyptic number.

It is an amenable number.

1326695989 is a deficient number, since it is larger than the sum of its proper divisors (18685931).

1326695989 is an equidigital number, since it uses as much as digits as its factorization.

1326695989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18685930.

The product of its digits is 6298560, while the sum is 58.

The square root of 1326695989 is about 36423.8381969830. The cubic root of 1326695989 is about 1098.8130417084.

The spelling of 1326695989 in words is "one billion, three hundred twenty-six million, six hundred ninety-five thousand, nine hundred eighty-nine".