1445143920 has 160 divisors (see below), whose sum is σ = 4901472000. Its totient is φ = 349317120.

The previous prime is 1445143913. The next prime is 1445143937. The reversal of 1445143920 is 293415441.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1316812 + ... + 1317908.

It is an arithmetic number, because the mean of its divisors is an integer number (30634200).

Almost surely, 2^1445143920 is an apocalyptic number.

1445143920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1445143920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2450736000).

1445143920 is an abundant number, since it is smaller than the sum of its proper divisors (3456328080).

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

1445143920 is a wasteful number, since it uses less digits than its factorization.

1445143920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623 (or 1617 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 1445143920 is about 38015.0485992061. The cubic root of 1445143920 is about 1130.5862517779.

The spelling of 1445143920 in words is "one billion, four hundred forty-five million, one hundred forty-three thousand, nine hundred twenty".