1245644445 has 16 divisors (see below), whose sum is σ = 2015426880. Its totient is φ = 656878464.

The previous prime is 1245644423. The next prime is 1245644447. The reversal of 1245644445 is 5444465421.

1245644445 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1245644445 - 2¹⁵ = 1245611677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245644447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 465199 + ... + 467868.

It is an arithmetic number, because the mean of its divisors is an integer number (125964180).

Almost surely, 2^1245644445 is an apocalyptic number.

1245644445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1245644445 is a deficient number, since it is larger than the sum of its proper divisors (769782435).

1245644445 is an equidigital number, since it uses as much as digits as its factorization.

1245644445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933164.

The product of its digits is 307200, while the sum is 39.

The square root of 1245644445 is about 35293.6884584199. The cubic root of 1245644445 is about 1075.9647211500.

The spelling of 1245644445 in words is "one billion, two hundred forty-five million, six hundred forty-four thousand, four hundred forty-five".