1445321745 has 64 divisors (see below), whose sum is σ = 2972067840. Its totient is φ = 652722624.

The previous prime is 1445321737. The next prime is 1445321767. The reversal of 1445321745 is 5471235441.

It is not a de Polignac number, because 1445321745 - 2³ = 1445321737 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 69222 + ... + 87648.

It is an arithmetic number, because the mean of its divisors is an integer number (46438560).

Almost surely, 2^1445321745 is an apocalyptic number.

1445321745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1445321745 is an abundant number, since it is smaller than the sum of its proper divisors (1526746095).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1445321745 is a wasteful number, since it uses less digits than its factorization.

1445321745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18531 (or 18525 counting only the distinct ones).

The product of its digits is 67200, while the sum is 36.

The square root of 1445321745 is about 38017.3874036604. The cubic root of 1445321745 is about 1130.6326227660.

The spelling of 1445321745 in words is "one billion, four hundred forty-five million, three hundred twenty-one thousand, seven hundred forty-five".