1209347945 has 24 divisors (see below), whose sum is σ = 1574163072. Its totient is φ = 891508800.

The previous prime is 1209347927. The next prime is 1209347947. The reversal of 1209347945 is 5497439021.

It is a de Polignac number, because none of the positive numbers 2^k-1209347945 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1209347896 and 1209347905.

It is not an unprimeable number, because it can be changed into a prime (1209347947) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 769010 + ... + 770580.

It is an arithmetic number, because the mean of its divisors is an integer number (65590128).

Almost surely, 2^1209347945 is an apocalyptic number.

It is an amenable number.

1209347945 is a deficient number, since it is larger than the sum of its proper divisors (364815127).

1209347945 is a wasteful number, since it uses less digits than its factorization.

1209347945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2513 (or 2500 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 1209347945 is about 34775.6803671761. The cubic root of 1209347945 is about 1065.4107888008.

The spelling of 1209347945 in words is "one billion, two hundred nine million, three hundred forty-seven thousand, nine hundred forty-five".