1445220743 has 4 divisors (see below), whose sum is σ = 1445297568. Its totient is φ = 1445143920.

The previous prime is 1445220727. The next prime is 1445220787. The reversal of 1445220743 is 3470225441.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3470225441 = 23 ⋅150879367.

It is a cyclic number.

It is not a de Polignac number, because 1445220743 - 2⁴ = 1445220727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1445220043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10955 + ... + 54867.

It is an arithmetic number, because the mean of its divisors is an integer number (361324392).

Almost surely, 2^1445220743 is an apocalyptic number.

1445220743 is a deficient number, since it is larger than the sum of its proper divisors (76825).

1445220743 is an equidigital number, since it uses as much as digits as its factorization.

1445220743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76824.

The product of its (nonzero) digits is 26880, while the sum is 32.

The square root of 1445220743 is about 38016.0590145796. The cubic root of 1445220743 is about 1130.6062851894.

The spelling of 1445220743 in words is "one billion, four hundred forty-five million, two hundred twenty thousand, seven hundred forty-three".