63949993 has 4 divisors (see below), whose sum is σ = 66012928. Its totient is φ = 61887060.

The previous prime is 63949981. The next prime is 63950011. The reversal of 63949993 is 39994936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63949993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63949993.

It is not an unprimeable number, because it can be changed into a prime (63949493) 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, 1031421 + ... + 1031482.

It is an arithmetic number, because the mean of its divisors is an integer number (16503232).

Almost surely, 2^63949993 is an apocalyptic number.

It is an amenable number.

63949993 is a deficient number, since it is larger than the sum of its proper divisors (2062935).

63949993 is a wasteful number, since it uses less digits than its factorization.

63949993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2062934.

The product of its digits is 1417176, while the sum is 52.

The square root of 63949993 is about 7996.8739517389. The cubic root of 63949993 is about 399.8957916039.

The spelling of 63949993 in words is "sixty-three million, nine hundred forty-nine thousand, nine hundred ninety-three".