1445021440 has 72 divisors (see below), whose sum is σ = 3643511760. Its totient is φ = 547577856.

The previous prime is 1445021419. The next prime is 1445021447. The reversal of 1445021440 is 441205441.

1445021440 = 3853² + 3854² + ... + 3947².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1445021447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5389 + ... + 54028.

It is an arithmetic number, because the mean of its divisors is an integer number (50604330).

Almost surely, 2^1445021440 is an apocalyptic number.

1445021440 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 1445021440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1821755880).

1445021440 is an abundant number, since it is smaller than the sum of its proper divisors (2198490320).

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

1445021440 is an equidigital number, since it uses as much as digits as its factorization.

1445021440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59457 (or 59443 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 1445021440 is about 38013.4376240824. The cubic root of 1445021440 is about 1130.5543107570.

Adding to 1445021440 its reverse (441205441), we get a palindrome (1886226881).

The spelling of 1445021440 in words is "one billion, four hundred forty-five million, twenty-one thousand, four hundred forty".