1326921 has 12 divisors (see below), whose sum is σ = 1815408. Its totient is φ = 861984.

The previous prime is 1326917. The next prime is 1326929. The reversal of 1326921 is 1296231.

1326921 = T₁₅₃ + T₁₅₄ + ... + T₂₂₅.

It is not a de Polignac number, because 1326921 - 2² = 1326917 is a prime.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1326891 and 1326900.

It is not an unprimeable number, because it can be changed into a prime (1326929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15946 + ... + 16028.

It is an arithmetic number, because the mean of its divisors is an integer number (151284).

2^1326921 is an apocalyptic number.

It is an amenable number.

1326921 is a deficient number, since it is larger than the sum of its proper divisors (488487).

1326921 is an frugal number, since it uses more digits than its factorization.

1326921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 159 counting only the distinct ones).

The product of its digits is 648, while the sum is 24.

The square root of 1326921 is about 1151.9205701783. The cubic root of 1326921 is about 109.8875158688.

The spelling of 1326921 in words is "one million, three hundred twenty-six thousand, nine hundred twenty-one".