1445921 has 2 divisors, whose sum is σ = 1445922. Its totient is φ = 1445920.

The previous prime is 1445887. The next prime is 1445929. The reversal of 1445921 is 1295441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1234321 + 211600 = 1111^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 1445921 - 2¹⁰ = 1444897 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1445929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 722960 + 722961.

It is an arithmetic number, because the mean of its divisors is an integer number (722961).

2^1445921 is an apocalyptic number.

It is an amenable number.

1445921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1445921 is an equidigital number, since it uses as much as digits as its factorization.

1445921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 26.

The square root of 1445921 is about 1202.4645524921. The cubic root of 1445921 is about 113.0788861019.

The spelling of 1445921 in words is "one million, four hundred forty-five thousand, nine hundred twenty-one".