1445893813 has 12 divisors (see below), whose sum is σ = 1811340300. Its totient is φ = 1144003392.

The previous prime is 1445893811. The next prime is 1445893819. The reversal of 1445893813 is 3183985441.

It can be written as a sum of positive squares in 2 ways, for example, as 577825444 + 868068369 = 24038^2 + 29463^2 .

It is not a de Polignac number, because 1445893813 - 2¹ = 1445893811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1445893811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1134288 + ... + 1135561.

It is an arithmetic number, because the mean of its divisors is an integer number (150945025).

Almost surely, 2^1445893813 is an apocalyptic number.

1445893813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1445893813 is a deficient number, since it is larger than the sum of its proper divisors (365446487).

1445893813 is a wasteful number, since it uses less digits than its factorization.

1445893813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2269876 (or 2269869 counting only the distinct ones).

The product of its digits is 414720, while the sum is 46.

The square root of 1445893813 is about 38024.9104272449. The cubic root of 1445893813 is about 1130.7817737373.

The spelling of 1445893813 in words is "one billion, four hundred forty-five million, eight hundred ninety-three thousand, eight hundred thirteen".