63983999 has 4 divisors (see below), whose sum is σ = 66765936. Its totient is φ = 61202064.

The previous prime is 63983951. The next prime is 63984007. The reversal of 63983999 is 99938936.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63983999 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 (63983099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1390934 + ... + 1390979.

It is an arithmetic number, because the mean of its divisors is an integer number (16691484).

Almost surely, 2^63983999 is an apocalyptic number.

63983999 is a deficient number, since it is larger than the sum of its proper divisors (2781937).

63983999 is a wasteful number, since it uses less digits than its factorization.

63983999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2781936.

The product of its digits is 2834352, while the sum is 56.

The square root of 63983999 is about 7998.9998749844. Note that the first 3 decimals coincide. The cubic root of 63983999 is about 399.9666618048.

The spelling of 63983999 in words is "sixty-three million, nine hundred eighty-three thousand, nine hundred ninety-nine".