1326721 has 8 divisors (see below), whose sum is σ = 1497600. Its totient is φ = 1164240.

The previous prime is 1326701. The next prime is 1326727. The reversal of 1326721 is 1276231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1326721 is a prime.

It is a super-2 number, since 2×1326721² = 3520377223682, which contains 22 as substring.

It is a Duffinian number.

1326721 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1326692 and 1326701.

It is not an unprimeable number, because it can be changed into a prime (1326727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1761 + ... + 2398.

It is an arithmetic number, because the mean of its divisors is an integer number (187200).

2^1326721 is an apocalyptic number.

1326721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1326721 is a deficient number, since it is larger than the sum of its proper divisors (170879).

1326721 is a wasteful number, since it uses less digits than its factorization.

1326721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4199.

The product of its digits is 504, while the sum is 22.

The square root of 1326721 is about 1151.8337553658. The cubic root of 1326721 is about 109.8819946641.

The spelling of 1326721 in words is "one million, three hundred twenty-six thousand, seven hundred twenty-one".