1647912945 has 32 divisors (see below), whose sum is σ = 3016495872. Its totient is φ = 752539392.

The previous prime is 1647912899. The next prime is 1647912949. The reversal of 1647912945 is 5492197461.

It is a happy number.

1647912945 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 1647912945 - 2¹¹ = 1647910897 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1647912894 and 1647912903.

It is not an unprimeable number, because it can be changed into a prime (1647912949) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98619 + ... + 114111.

It is an arithmetic number, because the mean of its divisors is an integer number (94265496).

Almost surely, 2^1647912945 is an apocalyptic number.

1647912945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1647912945 is a deficient number, since it is larger than the sum of its proper divisors (1368582927).

1647912945 is a wasteful number, since it uses less digits than its factorization.

1647912945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16521.

The product of its digits is 544320, while the sum is 48.

The square root of 1647912945 is about 40594.4940232047. The cubic root of 1647912945 is about 1181.1673177479.

The spelling of 1647912945 in words is "one billion, six hundred forty-seven million, nine hundred twelve thousand, nine hundred forty-five".