1326405971 has 18 divisors (see below), whose sum is σ = 1476155772. Its totient is φ = 1181994840.

The previous prime is 1326405961. The next prime is 1326405991. The reversal of 1326405971 is 1795046231.

It is not a de Polignac number, because 1326405971 - 2²⁶ = 1259297107 is a prime.

It is a super-3 number, since 3×1326405971³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1326405961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9542420 + ... + 9542558.

It is an arithmetic number, because the mean of its divisors is an integer number (82008654).

Almost surely, 2^1326405971 is an apocalyptic number.

1326405971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1326405971 is a deficient number, since it is larger than the sum of its proper divisors (149749801).

1326405971 is an frugal number, since it uses more digits than its factorization.

1326405971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 1326405971 is about 36419.8568228926. The cubic root of 1326405971 is about 1098.7329684067.

The spelling of 1326405971 in words is "one billion, three hundred twenty-six million, four hundred five thousand, nine hundred seventy-one".