145440445 has 4 divisors (see below), whose sum is σ = 174528540. Its totient is φ = 116352352.

The previous prime is 145440443. The next prime is 145440461. The reversal of 145440445 is 544044541.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17614809 + 127825636 = 4197^2 + 11306^2 .

It is a cyclic number.

It is not a de Polignac number, because 145440445 - 2¹ = 145440443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145440443) 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 3 ways as a sum of consecutive naturals, for example, 14544040 + ... + 14544049.

It is an arithmetic number, because the mean of its divisors is an integer number (43632135).

Almost surely, 2^145440445 is an apocalyptic number.

It is an amenable number.

145440445 is a deficient number, since it is larger than the sum of its proper divisors (29088095).

145440445 is an equidigital number, since it uses as much as digits as its factorization.

145440445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29088094.

The product of its (nonzero) digits is 25600, while the sum is 31.

The square root of 145440445 is about 12059.8691949789. The cubic root of 145440445 is about 525.8901843932.

Adding to 145440445 its reverse (544044541), we get a palindrome (689484986).

The spelling of 145440445 in words is "one hundred forty-five million, four hundred forty thousand, four hundred forty-five".