63994909 has 16 divisors (see below), whose sum is σ = 73120320. Its totient is φ = 55471360.

The previous prime is 63994883. The next prime is 63994921. The reversal of 63994909 is 90949936.

It is a cyclic number.

It is not a de Polignac number, because 63994909 - 2⁹ = 63994397 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 (63994309) 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, 25269 + ... + 27685.

It is an arithmetic number, because the mean of its divisors is an integer number (4570020).

Almost surely, 2^63994909 is an apocalyptic number.

It is an amenable number.

63994909 is a deficient number, since it is larger than the sum of its proper divisors (9125411).

63994909 is a wasteful number, since it uses less digits than its factorization.

63994909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2540.

The product of its (nonzero) digits is 472392, while the sum is 49.

The square root of 63994909 is about 7999.6818061720. The cubic root of 63994909 is about 399.9893934688.

The spelling of 63994909 in words is "sixty-three million, nine hundred ninety-four thousand, nine hundred nine".