1647948407 has 4 divisors (see below), whose sum is σ = 1883369616. Its totient is φ = 1412527200.

The previous prime is 1647948391. The next prime is 1647948427. The reversal of 1647948407 is 7048497461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7048497461 = 2789 ⋅2527249.

It is not a de Polignac number, because 1647948407 - 2⁴ = 1647948391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1647948427) 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, 117710594 + ... + 117710607.

It is an arithmetic number, because the mean of its divisors is an integer number (470842404).

Almost surely, 2^1647948407 is an apocalyptic number.

1647948407 is a deficient number, since it is larger than the sum of its proper divisors (235421209).

1647948407 is an equidigital number, since it uses as much as digits as its factorization.

1647948407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235421208.

The product of its (nonzero) digits is 1354752, while the sum is 50.

The square root of 1647948407 is about 40594.9308042273. The cubic root of 1647948407 is about 1181.1757903344.

The spelling of 1647948407 in words is "one billion, six hundred forty-seven million, nine hundred forty-eight thousand, four hundred seven".